Add couchdb cache
Add couchdb cache
Merge branch 'master' of http://github.com/ecologylab/BigSemanticsService

Conflicts:
	BigSemanticsService/src/ecologylab/bigsemantics/documentcache/CouchInterface.java
	BigSemanticsService/src/ecologylab/bigsemantics/documentcache/CouchPersistentDocumentCache.java

Add couchdb cache