initial integration with mongo service

cleaned up some tests

added tests around mongo service finders

added out dir to git ignores

mongo db integration
fixed test
Adding StartMongoDbTask
added integration test to mongo service
changed to make the test pass
Using MongoDb plugin which stops MongoDb instance after execution of last task
Merge branch 'mongo_db_integration' of github.com:Where2Pair/Where2Pair into mongo_db_integration
Merge remote-tracking branch 'origin/mongo_db_integration' into mongo_db_integration

Conflicts:
	build.gradle
	gradle/wrapper/gradle-wrapper.properties
	src/test/groovy/org/where2pair/venue/integration/MongoServiceIntegrationSpec.groovy