Update ImportsChecker.scala

Add legalImportsList to IllegalImportsChecker
Update pom.xml
Rename to exemptImportsList and added a unit test
Update pom.xml
Merge pull request #82 from maxnajim/master

Add the capability of an exemptImports list to ImportsChecker
Merge pull request #87 from ScrapCodes/comment-check

Check for single space after comment starts.
Renamed SpaceAfterCommentStart to SpaceAfterCommentStartChecker
An improvement to comment style checker to ignore comments of ///+ style.