Merge pull request #12 from ralphbean/master

Forgot to include LICENSE in manifest.in
Added preliminary tests for json serialization mixin.
Default to unicode and fallback to str.
Test datetime serialization.
Merge pull request #15 from ralphbean/serialization

Serialization
Cleaned up the way parsing is done to filter with better regexes
updated version for release
added support for startswith, endswith, and contains
cast integers when we get them
bumped version and fixed a relationship triggering bug
released new version
For some reason, my _decl_class_registry has a few none-Base things.