Finish 3.3.0

Finish 3.2.0

Finish 3.1.1

Release 3.1.0:

* Add support of activemodel 5.2

Version 3.1.0

Finish 3.0.0

Release 2.1.0:

* Separate Float & Double types

Version 2.1.0

Release 2.0.2:

* Add support for xsd:anyURI

Version 2.0.2