Make frameworks and runtimes optional

- If framework is not specified use buildpack framework by default

- If runtime is not specified use ruby19 runtime by default
Make frameworks and runtimes optional

- If framework is not specified use buildpack framework by default

- If runtime is not specified use ruby19 runtime by default
Update TODO in comments and rebase master
Merge branch 'optional-framework-runtime' of github.com:cloudfoundry/cloud_controller_ng into optional-framework-runtime

Conflicts:
	lib/cloud_controller/models/app.rb
Merge pull request #16 from cloudfoundry/optional-framework-runtime

Make frameworks and runtimes optional - merged by Jennifer & Bleicke