- Changed ThrustConfig property 'config' to 'app_config'
- Made XcodeTools clean_build method public
- Removed ThrustConfig's xcode_clean method
- Refactored cedar.rake clean_build to use now-public method
 - Removed unused methods from ThrustConfig
 - Created method clean_and_build_target on XcodeTools
 - Simplified cedar.rake task to use new method
Merge branch 'master' of github.com:pivotal-beach/thrust