Beginning integration of ShareMeNot: added resources, useless callback.
Basic button replacement working.
Replacement and unblocking seem to work correctly in most cases.
Adding appropriate license text
Changed replacement buttons to use PrivacyBadger icon, not ShareMeNot.
Merge remote-tracking branch 'upstream/cookiehandlingexperiment' into sharemenot
Merge remote-tracking branch 'upstream/master' into sharemenot
Merge remote-tracking branch 'upstream/master' into sharemenot

Conflicts:
	src/webrequest.js
Fixed AddThis button re-enabling.
Merge remote-tracking branch 'upstream/master' into sharemenot
Cleanup of unneeded stuff.
cleanup spacing issue
Support for newer version of Facebook button, and fixed race condition.
Previous fix to race condition broke things when userunblock, fix in better way.
Merge pull request #196 from froeschele/sharemenot

Integrate ShareMeNot functionality. Fixes #84