Add the ability to set where the admin pages are rooted. Creates a new configuration option called “adminRoot”.
Allow administrators to provide a twitter account to post updates to.

This is a global setting and tweets are sent when a post is published the first time.
Add admitRoot to Ghost.paths for consistency with other path settings.
Added information about the adminRoot feature to README.
Merge branch 'updatetwitter'

Conflicts:
	core/server/routes/admin.js
Update readme to include information about this fork.
Update readme to include information about this branch.
Merge branch 'updatetwitter'

Conflicts:
	README.md