Fix newline appearing in textarea in ChatApp

Call event.preventDefault() to stop a newline being added to the
textarea in the MessageComposer component.
Update docs - rephrase the source code structure

The index.html is not a result of any compilation/bundling process rather the bundle.js.
This has been clarified in the rephrasing.
Merge pull request #72 from 2color/patch-1

Update docs - rephrase the source code structure
Merge pull request #70 from johanhelsing/f_removenewlineinchatexample

Fix newline appearing in textarea in ChatApp
Added cursor pointer to none active thread items
Merge pull request #74 from ptomasroos/master

Added cursor pointer to none active thread items
[docs] use camelcase for property names in JS

These weren't ending up in the generated HTML.
[docs] added missing semicolon in Dispatcher code sample
Merge pull request #79 from sethmcl/master

[docs] added missing semicolon in Dispatcher code sample
Update link to TodoMVC tutorial in README

Former link pointed to React website; the newer Flux website is the appropriate location.
Merge pull request #81 from ihodes/patch-1

Update link to TodoMVC tutorial in README