Pump entity

Adds an entity that can pump data to a MarkLogic server.

* Run `mvn clean install -PIntegration` in demo-content-pump module to verify download and format procedure works
* Run `mvn clean install -PLive -Dtest=ContentPumperLiveTest` in brooklyn-marklogic for real data against real server.
* Invoke effectors on ContentPumper entity in AMP for normal use.