Extended cobra random testing framework with exceptions

An @expected{ExceptionName} can now be added to tests to check for the
occurrence of both Rascal and Java exceptions.
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
Removed right hand symbol from message.
Some forgotten fixes related to lrel