redirect to login page if trying to  destroy user session when current_user_session is nil
Merge pull request #193 from jsh-c/fix-session-destroy

redirect to login page if destroying the user session when the current user session is null
Change font-awesome gem.
Add missing style to button.
Changes for new icon names.
Replace some old font syntax with new helper method.
Replace old string concatinated font syntax with new helper method.
Update font syntax used in icon_link_to helper.
Apply fixed width class to some icons.
Remove icon_link_to helper.
Merge pull request #194 from t-bullock/fix-button-style

Add missing style to button.
Merge pull request #195 from t-bullock/font-awesome-4

Font Awesome 4 support
Remove duplicate stylesheet include.
Merge pull request #196 from t-bullock/fix-forum-css-error

Remove bad stylesheet include.
Update TinyMCE config options for version 4.
Merge pull request #199 from t-bullock/update-mce-config

Update TinyMCE config options for version 4.
Merge branch 'rails4' of https://github.com/bborn/communityengine into rails4