Dropping explicit rvm support. Doing cd to TO_PROJECT_DIRECTORY to fix https://github.com/rspec/rspec-tmbundle/pull/54 and other related issues.
Restoring rvm_textmate
Merge pull request #56 from evgeny-myasishchev/cd-approach

Dropping explicit rvm support. Doing cd to TO_PROJECT_DIRECTORY to fix #54
Merge