Add display/setting of default values in component-create.

[timoxley]

This adds some items of functionality relating to component-create's default values:

Prevents crash when not supplying username/repo for non-local components

Instead it just prompts user to fix, keeping all existing values (resolves #352).

> component-create /tmp/test-component
repo (username/project): [timoxley/test-component] nousername
description: a description
does this component have js? [yes]
does this component have css? [yes] no
does this component have html? [yes] no
  repo must be <username>/<project> : nousername
repo (username/project): [nousername] user/username
description: [a description]
does this component have js? [yes]
does this component have css? [no]
does this component have html? [no] yes

      create : /tmp/test-component
      create : /tmp/test-component/index.js
      create : /tmp/test-component/template.html
      create : /tmp/test-component/Makefile
      create : /tmp/test-component/Readme.md
      create : /tmp/test-component/History.md
      create : /tmp/test-component/.gitignore
      create : /tmp/test-component/component.json

Sets default project repo/name to be $USER + CWD

> component-create /tmp/test-component
repo (username/project): [timoxley/test-component]
description:
does this component have js? [yes]
does this component have css? [yes]
does this component have html? [yes]

      create : /tmp/test-component
      create : /tmp/test-component/index.js
      create : /tmp/test-component/template.html
      create : /tmp/test-component/test-component.css
      create : /tmp/test-component/Makefile
      create : /tmp/test-component/Readme.md
      create : /tmp/test-component/History.md
      create : /tmp/test-component/.gitignore
      create : /tmp/test-component/component.json

or just CWD for local components:

> component-create --local locals/test
name: [test]
description:
does this component have js? [yes]
does this component have css? [yes]
does this component have html? [yes]

      create : locals/test
      create : locals/test/index.js
      create : locals/test/template.html
      create : locals/test/test.css
      create : locals/test/component.json

Also displays default values in [ & ]if they exist.

May want to consider something that allows setting default user to something other than $USER.

[timoxley]

I wonder if defaults functionality could be added directly to commander.js.

[timoxley]

Also, no tests because there were no tests for component-create. you know, broken windows and all that. I could knock some up I guess.

[timoxley]

bump

[tj]

we could maybe check for ~/.gitconfig:

[github]
    user = visionmedia

[tj]

little overkill maybe

[timoxley]

ahh you could tap into the github config inheritance thing using git config github.user, but would require an async call to child_process.exec, which makes the code more ugly as everything else in here is sync…

[jonathanong]

oh god why wasn't this merged. i used component create for the first time the other day and was like "WHERE ARE THE DEFAULTS, MAN!?"

[jonathanong]

componentjs/create.js#5