(CDAP-335) Remove ResourceSpecification to remove unnecessary complication.
Merge pull request #496 from caskdata/feature/unify-api

(CDAP-335) Remove ResourceSpecification to remove unnecessary complication
Merge branch 'develop' into feature/configurer-for-serviceworker

Conflicts:
	cdap-api/src/main/java/co/cask/cdap/api/service/AbstractServiceWorker.java
	cdap-app-fabric/src/main/java/co/cask/cdap/internal/app/services/ServiceTwillApplication.java
minor comment I unintentionally omitted from from merge: 301f8fdc38c2601e41adf2caf5532ef9f6518fec