Added the ability to confirm email addresses.

Whenever the users email address changes, be it from github or the
preferences page, an email is sent to the user with a confirmation token
and the previous confirmation (if any) is reset. When the user follows
the confirmation link, the email address is confirmed.

Before the email address is confirmed, no daily or weekly emails will be
sent out.
Merge pull request #273 from rrooding/updated_docs

Updated readme to ruby 2.0.0
Improved confirmation email wording
Merge pull request #272 from rrooding/feature-confirmable-email

Added the ability to confirm email addresses.
Gem updates
Updated schema
moar gem updates!!
Merge pull request #274 from jasnow/master

Updated Gemfile.lock file
Gem updates
Updated brakeman
Merge pull request #275 from jasnow/master

Updated Gemfile.lock file
Merge pull request #276 from jasnow/master

Updated Gemfile.lock file
Gem updates
Gem updates
Merge pull request #277 from jasnow/master

Updated Gemfile.lock file
Gem updates
Merge branch 'master' of git://github.com/andrew/24pullrequests
After 'git pull parent master'; green rake