Don't use TM_RUBY for running Rake tasks

This still supports using `TM_RAKE` to set the version of rake to use when running tasks.
Support comment groups in regular expressions

Fixes #35.
Give full path to helper library

This is required in 2.0 as we longer augment the PATH with the bundle support bin folder. Fixes #56.
Documentation lookup now default to ri v1.0.1 (ruby 1.8)

This is because the newer version does not support “plain” as format.
Add new documentation lookup command (Mavericks)

The implementation has changed so that it is now possible to use “back” to go back to previous page, it also auto-links things that look like method symbols.

Presently though it does not auto-link methods listed in the includes, class, and instance method sections. Also, it shows the markdown output from ri pretty much as-is.

It uses the version of ri included with OS X 10.9 (Mavericks) so the command is only made available to people on 10.9.
Merge branch 'textmate'