Remove second, unused subscription parameters.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5224 9866e705-20ec-0310-96e7-cbb4277adcfb
Move admin CSS and JS out of `admin_head` and into proper enqueues. New `admin.css` replaces top level icons with Dashicons, introduced in WordPress 3.8. Fixes #2396. See #2463.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5225 9866e705-20ec-0310-96e7-cbb4277adcfb
First pass at replacing `Green` admin color scheme with `Mint` and `Evergreen` for WordPress 3.8. More to do here. Props melchoyce, ryelle. See #2462.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5226 9866e705-20ec-0310-96e7-cbb4277adcfb
Force `colors-fresh` dependency to act as a foundation for `Mint` and `Evergreen` color schemes. Fixes #2462.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5227 9866e705-20ec-0310-96e7-cbb4277adcfb