Moved unit test files to appropriate folder
Improved error handling for ImpactoriumHandler
Added DummyRestHandler
Added single line comments to grammar lexer
DummyRestHandler sends triple result specified in the pattern construct field  to rest service
Preparing to release 0.4.1; Added maven release plugin and corresponding configuration; Refactored pom version to correspond with git tag version (0.4.1)
Minor typo in pattern method toString