Improved Toolbar UI

**Changelog:**
* Added CSS-styles and corrected some labels, classes, ids.
* Added two new variables: "theme_name" and "theme_editor".
* Added links that refer to the WP-editor of current Wrapper.

**New Look:**
![roots_wrapper](https://f.cloud.github.com/assets/3831204/2430806/24b35026-ad06-11e3-9cd5-aa1a0d1c9b29.png)