Make unblock buttons clearer, tweak wording
Remove unnecessary logging message
Emphasize that 'unblock' resets all trackers
Update firstRun.html from PB Chrome

Commented out the social links because we probably don't want
to advertise heavily until some commenting issues + private
browsing mode support is fixed.
Merge pull request #101 from EFForg/feature/add-disable

Some UI-related improvements for 0.1.3