Improved the parser

- Added support to Cache tags
- Added support to hbm with multiples classes
- Added GeneratedBy support to GuidComb, Guid, Identity and improved message to unknown generators
- Added Cascade support to AllDeleteOrphan and improved message to unknown cascades
- Improved one-to-one and many-to-many parser
- Converted to Visual Studio 2013
- Configurated Nuget