Highlight the status of extensions and contexts.
Option to create new context on notification
Highlight the target to drop the extension improves visualization.
Option to display the icon of the context or the extension icon on the popup
Adjustment to prevent errors for existing contexts
Best grip for contexts handle
Adjust the sortables
Merge pull request #22 from thiagomt/master

I'm merging this now and I'll do my fixes on the top of your changes. Thanks again, you are great!
Fixing issues found by WebStorm
Merge branch 'master' of github.com:kdzwinel/Context
Improving code responsible for checking status of contexts.
Code formatting and small improvements.
Fixing bug on options page - context after cloning wasn't fully functioning.
Also, code formatting.
Preserving state of 'highlight ungrouped extensions' checkbox between options page reloads.
Removing social icons on options page when user is offline.
Using Chrome Sync to store context configuration.
Adding missing strings to translation files. Updating polish translation. Updating cleanup.php script to PHP 5.3+.
Fixed cleanup.php script and new messages added to all messages.json files.
Merge branch 'messages_fix' and update polish translation.

Conflicts:
	_locales/cleanup.php
	_locales/de/messages.json
	_locales/en/messages.json
	_locales/es/messages.json
	_locales/fr/messages.json
	_locales/it/messages.json
	_locales/ja/messages.json
	_locales/pl/messages.json
	_locales/pt_BR/messages.json
	_locales/zh_CN/messages.json
Updating polish translation + small improvement in cleanup.php.