changed the PHPConventions class so that identifier validation works properly. (Issue #48)
added a messages.properties file for the org.pdtextensions.core bundle. (Issue #48)
changed the Checks class to use the org.eclipse.dltk.internal.corext.refactoring.RefactoringCoreMessages class instead of the org.pdtextensions.internal.corext.refactoring.RefactoringCoreMessages class. (Issue #48)
changed the BUNDLE_NAME of the org.pdtextensions.core.ui.Messages class. (Issue #48)
changed the property name convention_illegalIdentifier to Convention_illegalIdentifier. (Issue #48)