Refactored SuiteProgressMeter
Optimized memory use: let data structures be garbage collected after they are not anymore needed
SuiteListener: added onTestFileFound, onAllTestFilesFound, onTestFileFinished
Hooked in SuiteListener.onAllTestFilesFound()
Hooked in SuiteListener.onTestFileFound()
Hooked in SuiteListener.onTestFileFinished()
SuiteMother/EventBuilder: use onTestFileFound, onAllTestFilesFound, onTestFileFinished