Mission editing slang (#447)

* update js-slang imports, and use null for empty list

* pass tests

* pass tests

* format all external libraries with prettier

* Update README.md

* minorOverviewChanges

* minorOverviewChanges1

* AddedAssignmentSupport

* minorOverviewChanges2

* placed xmlpharser in alt file

* update js-slang to version 0.2.0

* Bump showdown from 1.8.6 to 1.8.7 (#397)

Bumps [showdown](https://github.com/showdownjs/showdown) from 1.8.6 to 1.8.7.
- [Release notes](https://github.com/showdownjs/showdown/releases)
- [Changelog](https://github.com/showdownjs/showdown/blob/master/CHANGELOG.md)
- [Commits](showdownjs/showdown@1.8.6...1.8.7)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* update acorn, fix order of imports

* Bump react-redux from 5.0.7 to 5.1.0 (#401)

Bumps [react-redux](https://github.com/reduxjs/react-redux) from 5.0.7 to 5.1.0.
- [Release notes](https://github.com/reduxjs/react-redux/releases)
- [Changelog](https://github.com/reduxjs/react-redux/blob/master/CHANGELOG.md)
- [Commits](reduxjs/react-redux@v5.0.7...v5.1.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Bump react-ace from 6.1.4 to 6.2.0 (#398)

Bumps [react-ace](https://github.com/securingsincity/react-ace) from 6.1.4 to 6.2.0.
- [Release notes](https://github.com/securingsincity/react-ace/releases)
- [Changelog](https://github.com/securingsincity/react-ace/blob/master/CHANGELOG.md)
- [Commits](securingsincity/react-ace@6.1.4...6.2.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Bump react from 16.4.2 to 16.6.0 (#399)

Bumps [react](https://github.com/facebook/react) from 16.4.2 to 16.6.0.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](facebook/react@v16.4.2...v16.6.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Bump node-sass-chokidar from 1.3.3 to 1.3.4 (#400)

Bumps [node-sass-chokidar](https://github.com/michaelwayman/node-sass-chokidar) from 1.3.3 to 1.3.4.
- [Release notes](https://github.com/michaelwayman/node-sass-chokidar/releases)
- [Changelog](https://github.com/michaelwayman/node-sass-chokidar/blob/master/CHANGELOG.md)
- [Commits](https://github.com/michaelwayman/node-sass-chokidar/commits)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* [Security] Bump stringstream from 0.0.5 to 0.0.6 (#414)

Bumps [stringstream](https://github.com/mhart/StringStream) from 0.0.5 to 0.0.6. **This update includes security fixes.**
- [Release notes](https://github.com/mhart/StringStream/releases)
- [Commits](mhart/StringStream@v0.0.5...v0.0.6)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Bump typesafe-actions from 1.1.3 to 3.0.0 (#438)

Bumps [typesafe-actions](https://github.com/piotrwitek/typesafe-actions) from 1.1.3 to 3.0.0.
- [Release notes](https://github.com/piotrwitek/typesafe-actions/releases)
- [Commits](piotrwitek/typesafe-actions@v1.1.3...v3.0.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* update readme

* [Security] Bump lodash from 4.17.10 to 4.17.11 (#434)

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.10 to 4.17.11. **This update includes security fixes.**
- [Release notes](https://github.com/lodash/lodash/releases)
- [Changelog](https://github.com/lodash/lodash/blob/master/CHANGELOG)
- [Commits](lodash/lodash@4.17.10...4.17.11)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* [Security] Bump macaddress from 0.2.8 to 0.2.9 (#415)

Bumps [macaddress](https://github.com/scravy/node-macaddress) from 0.2.8 to 0.2.9. **This update includes security fixes.**
- [Release notes](https://github.com/scravy/node-macaddress/releases)
- [Commits](scravy/node-macaddress@0.2.8...0.2.9)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Bump @types/enzyme from 3.1.13 to 3.1.17 (#440)

Bumps [@types/enzyme](https://github.com/DefinitelyTyped/DefinitelyTyped) from 3.1.13 to 3.1.17.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* created editing folder

copy of assessment, may be merged later

* added interface

* library parsing

* Local storage

Missions are now loaded in local storage

* packages fixed

Author: gerhean

README.md

@@ -1,5 +1,3 @@
-# Cadet Frontend 
-
 [![Build Status](https://travis-ci.org/source-academy/cadet-frontend.svg?branch=master)](https://travis-ci.org/source-academy/cadet-frontend)
 [![Coverage Status](https://coveralls.io/repos/github/source-academy/cadet-frontend/badge.svg?branch=travis)](https://coveralls.io/github/source-academy/cadet-frontend?branch=travis)
 
@@ -21,6 +19,17 @@ In package.json, change line 19:
 to:
 "start-js": "set PORT=80 & react-scripts-ts start",
 
+## For Testing of js-slang
+
+1. Follow the instructions on js-slang to transpile your own copy
+2. Edit line 41 of package.json in this project to link to the directory of your js-slang and then run `yarn`:
+
+`"js-slang": "file:path/to/js-slang",`
+
+Note that this copies your files over, any future changes will not be reflected. 
+
+You may try [this](https://medium.com/@alexishevia/the-magic-behind-npm-link-d94dcb3a81af) for a smoother experience.
+
 ## Application Structure
 
 1. `actions` contains action creators, one file per reducer, combined in index.