remove using minimal_test_helper from test_helper. 

It prevents you from running rake test:models or any rake test:xyz, causes by the require of 
test/unit
update config.ru and Rakefile to default rails 4
taggable_type should be accessible for test
remove use of .all on model
empty non-saved project caused rss builder to fail
fix failing tests

Includes a monkey patch for Arel that may need to be removed when 4.0.0 final ships
Start using actionpack-xml_parser as a gem

XML param parsing was removed from rails 4. We may need to look into dropping support 
for xml api perhaps in favor of a good json api