Gradle system properties

Potential way of both building against snapshots versus releases with teamcity as well as building projects that require external libraries with teamcity. 


The idea is to have a place for TeamCity builds to reference the libraries we need to run all the sample apps (such as Omniture and Freewheel, where we arent suppose to provide the dependencies). Will -P allow us to point to a library path that will work that way?