Minor fixes

* Fixed bug where Memegur's icon would show up on Livememe's main page
* Wrapped content script in an immediately executed function
* Content script immediately calls noConflict() and uses its local
jQuery to not conflict with other jQuery versions that may be on the
page
3 new sites supported

* Added support of memecaptain.com, memegen.com and memesnap.com
2 new sites supported

* Added support of memedad.com and memegenerator.net
Changed version to 0.1.2