Experiment with `grunt-pot`:

* Add `grunt-pot` to `package.json`
* Adds grunt task `pot` to `grunt build` and `grunt build-release`
* Creates `bbpress.pot` in `/build` & removes `bbpress.pot` from `/src`
* Checks for the following keywords: `__`, `_e`, `_x`, `_n`, `_ex`, `_nx`, `esc_attr__`, `esc_attr_e`, `esc_attr_x`, `esc_html__`, `esc_html_e`, `esc_html_x`, `_nx_noop`
* Props netweb. See #2542.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5290 9866e705-20ec-0310-96e7-cbb4277adcfb
Fix incorrect `bbbpress` text domain used `bbp_get_topic_pagination_count`. Props netweb. Fixes #2549.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5291 9866e705-20ec-0310-96e7-cbb4277adcfb
Remove `colors-fresh` dependency for admin color schemes. !WordPress 3.9's CSS cleanup initiatives have rendered this code unnecessary. Hat tip helen.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5292 9866e705-20ec-0310-96e7-cbb4277adcfb