Merge pull request #11 from dokai/master

Fix the order of i18n:attributes values to match Chameleon
po-to-xls: skip obsolete messages.
Prepare 1.4 release.
Onwards
Abort on XML errors.
Update ignore.
Remove bad test.
Add test for bad python robustness.
Prepare 1.5 release.
Report errors in ZCML as well.
Onwards
Add support for plurals by checking the expected format of the extraction and if it has translatable strings return an iterable of message ids. Additionally, make sure the function is returned to babel, so these plurals can be validated correctly
Update changelog
Merge pull request #22 from MatthewWilkes/master

Add pluralize() calls to lingua
Prepare 1.6 release.
Onwards
po-xls tools have been moved out.
Add Python3 support to XML extractor
Use AST for python extractor

This removes the need to work around insane compat problems with python
3 and greatly simplifies the code.
Add new extract command

This replaces the use of pybabel to drive extraction.