Merge pull request #460 from aledsage/fix/HttpFeedTest

Renamed HttpFeedIntegrationTest to HttpFeedTest
Fix ExecutionManager.getTasksWithAllTags signature

- Use Iterable<?> instead of Iterable<String> for parameter type
Use entity proxy, rather than direct entity ref

- Adds EntityManager interface
- Adds ApplicationBuilder as a tailored interface for defining apps
- Adds Recipe for defining an entity to be created
- Adds entityManager.createEntity(Recipe) for creating new entities
- Adds EntityProxy (a dynamic proxy for calling entities)
fixing tests
convert TomcatServer to interface+impl
Delete TomcatServerTest

- Test has been disabled for a very long time, and relies on
  groovy magic that won't work anymore because we're TomcatServer
  was converted to Java.