Adds disabled TextMate RSpec and renames 'ruby rspec' to 'Ruby RSpec'

So that when installed on top of new RM5 configuration set they clobber
built in templates with the same names.
Binds meta+alt+[UP/DOWN] to next/prev diff in file

So that you can use meta+alt+[LEFT/RIGHT] to move between files and
meta+alt+[UP/DOWN] to move bektween changes in a file