Added new error type
Moved validation rule
Added isValidReservedPropertyCall helper method
Merge branch 'master' of https://github.com/feupeu/SW401F14-Xtext

Conflicts:
	dk.sw401f14.tainc/src/dk/sw401f14/tainc/validation/TAInCValidationUtil.xtend
Renamed helper methods
Added checkValidEventInformationCall validation rule