Only the entrypoints to inner modules now calculate the chart data

It no longer functions the same as chartData fetching was moved to
higher layers.

Move chart data calculation to source code edges

…ugin/

With this step, building and testing works but linting does not yet.

Setup Lerna monorepo, splitting reporter to new package

This was a blooper done in 14b6356

Fix .gitignore being too eager

Clean up package.json and dir structure in reporter-treemap

New versions can now be published with the same-old
"yarn run npm-publish" workflow as before.

Improve npm scripts

Now the outputPath isn't coupled with the bundleDir anymore, which could
be `null`.

webpack will even refuse to run if compiler.outputPath is not set, so it
makes no sense to add CLI fallback logic more suitable for CLI usage
(process.cwd()) to the plugin code.

It should not matter at all what the current working directory is when
the code runs through the plugin code.

Add custom reporter configuration

* Allow webpack modules to be wrapped in arrow functions.

* Add chunk sizes to sidebar

* v2.9.0

* Add info about ModuleConcatenationPlugin to README.md

* Fix typo

* Move validBundleWithArrowFunction test files to correct dir

This is needed to fix the incorrect merge conflict commit
aaf765c

electron@1.8.0 has been yanked and trying to install it will fail. There
hasn't yet been a new release of nightmare that pins the electron to
1.7.x release, so I'll have to point to a commit directly.

This is the major win in using yarn workspaces to manage the monorepo.
We'll only have one yarn.lock file now, whee!

Switch lerna and yarn to use workspaces

This commit is part of the `master` branch, the merge commit of PR #121

This commit is part of the `master` branch, the merge commit of PR #122

This commit is part of the `master` branch, the merge commit of PR #131

This contains the merge of #129

* Extract Logger class to own package

* Add README.md for logger package