Use absolute path to Ruby 1.8

Prevent "Bad file descriptor" bug on OSX Mavericks when running a focused unit test.
Use version 1.8 of ruby for bundle items

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.

#ignore
Allow for method names that end in =

Further fixes #59.
Merge remote-tracking branch 'textmate/master'