Allow users to pass TEST-TIMEOUT-MS as param

It would be nice if `complete-topology` allowed a usere to pass in
the default timeout as a parameter. This PR adds functionality without
breaking any existing code. Tests pass.
Merge branch 'master' of https://github.com/aaronlevin/incubator-storm into STORM-354

Conflicts:
	storm-core/src/clj/backtype/storm/testing.clj

STORM-354: Testing: allow users to pass TEST-TIMEOUT-MS as param for complete-topology
Added STROM-354 to changelog and readme.