parallelized tester

at my dual-core tester finishes ~60% faster (full cpu usage)

added TestQueue class
suites now have TestQueue instance that queues and runs Tests
defaults to two (or more if more cores available)
- Travis has '1.5 virtual cores' (weird)
dropped index parameter from suite callback
added index parameter to Reporter
dropped double Suite::filterTargetFiles calls
small fix in bluebird defs