Clarify commands purpose in panel context
Fix invalid shortcuts for editing properties in Styles Panel

- fix invalid shortcut for next property edit mode entry
- fix invalid shortcut for previous property edit mode entry
Add new Chrome Dev Tools shortcuts

- general
- console
- styles
- elements
Order of entries is based on Google's docs order.
Mac OS X versions (tested)
Merge pull request #24 from peterblazejewicz/master

Add new shortcuts and some fixes for Chrome Dev Tools cheatsheet