two small improvements
Merge branch 'master' into refactoring
updates spoon version
moves the hasChanges method for TranslatableGettextMessages to the TranslatableGettextMessage class.
adds values to a new gettext message from the selected old one and changes the method names
modifies exceptions
fixes NPE. just add either singular msgstr or plural msgstr
improves the code. TranslatableMessage-instances matters the plural again. The CatalogFormat instance has to ensure that there isn't an illegal message.. furthermore it contains a few bugfixes and improvements
adds translatable expression to the sourcereference compare methods