1.3.1

Closed issues:

• Typecasting for id field #293
• Should action('xyz')->execute() trigger hooks? #291

Merged pull requests:

• Feature/various improvements #297 (romaninsh)
• use ValidationException #296 (DarkSide666)
• works better with namespaces #295 (romaninsh)
• works better with namespaces #294 (romaninsh)
• Travis db testing #292 (gartner)
• Although we have added PostgreSQL, persistence does not recognize it #287 (romaninsh)
• Allows static persistence to use empty array #286 (romaninsh)