Open File in Brackets from Finder (OSX)

What Changed:
Updated Info.plist's list of Open With... file types to match those listed in src/languages/languages.json.

References:
1. [Brackets Backlog Item](https://trello.com/c/lg6sQ2fR/644-0-open-file-in-brackets-from-finder-osx)
2. [Edge Code Backlog Item](https://trello.com/c/7kkjOJDz/116-2-open-file-in-brackets-from-finder-osx)
3. [related Brackets issue](https://github.com/adobe/brackets/issues/1173)

Notes:
Please note that recent work (Sprint 27?) in Brackets already added the ability for Brackets to be opened from a selected file in the Finder app.  This change simply updates the list of file types that the Finder uses to determine whether to show the `Open With...` context menu item.

Also, please note that the `Open With...` command won't fully work if your .app is configured to prompt for the index.html on launch. Doing so will allow the app to launch, but the files selected in the Finder won't be opened. To get this to work, use the script 'tools/setup_for_hacking.sh' to set the Brackets src folder on launch.

Lastly, if you do not immediately see the updated Open With... list in the Finder context menu, you might need to restart the Finder (eg. Restart your Mac) after running the updated Brackets.app the first time.