Fixes for TextMate 2 and OS X 10.9 Mavericks

* **Use Ruby 1.8 for bundle commands.**
  10.7 and 10.8 only include ruby 1.8, so all bundle items have been written to work with that. Optionally supporting ruby 1.9 and 2.0 is problematic as these versions are not fully backwards compatible.

* **Fix `Insert Color` command for TextMate 2.**
  Taken directly from the CSS bundle: https://github.com/textmate/css.tmbundle/blob/12736e8b0ff222b3191ea0a9c1e4a73083919c4b/Commands/Insert%20Color.plist

* **Add CSS3 properties to `Documentation for Property` command.**
  Taken directly from the CSS bundle: https://github.com/textmate/css.tmbundle/blob/12736e8b0ff222b3191ea0a9c1e4a73083919c4b/Commands/Documentation%20for%20Property.plist