Add WordPress as submodule
Move plugins to new site_overwrites dir and use submodules when we can
Remove old WP install
Build WP site on deploy
Merge branch 'upgrade-wp-3.8.1'
Merge branch 'upgrade-wp-3.8.1' into xyu.io

Conflicts:
	conf/custom-boot.sh
Update README
Merge branch 'upgrade-wp-3.8.1'
Merge branch 'master' into xyu.io