Added ignore of .ruby-version file for rbenv since we want the version of Ruby to be arbitrary... but needs some work still to get there.
Updated cmock and unity to latest.
Fixed header multiple inclusion error in temp_sensor example to eliminate build warning.
Updated defaults in lib/ceedling/defaults.rb according to issue #37 to fix builds on OSX Maverick.
Fixed API collision between Ceedling and CMock.
Updated specs to use new rspec mock API to address API deprecations.
Bumbed version info for new release 0.15.3 since all specs are now passing.