adds a description tag to the translatable annotation which is used for the context #9
adds a description to the test configuration and a test which adds multiple context messages to a few catalog messages.
adds the context of the old catalog to the new one
renames description to context
adds the context to the equals and hashcode method of the TranslatableMessage class
adds the context to the compareCatalog method of the PlaintextGettextCatalogFormat class
Merge remote-tracking branch 'origin/context' into spoon_integration