Merge pull request #12 from smirolo/master

More unit tests
Merge pull request #13 from smirolo/master

Cant run tests in parallel :(
Merge pull request #14 from smirolo/master

Actually had fixed more bugs related to running ChiselMain multiple times
Refactored LockingArbiter, added LockingRRArbiter, refactored Arbiter and RRArbiter as specific extensions of those
jenkins run sbt scct:test, which reads test configuration from ScctTest instead of Test