Middleware and PSR App

Merge pull request #7 from FreeElephants/middleware

Middleware

Validation and response factoring

Request validation (#6)

* Remove unused package, and suggest it

* Add validation subpackage

* Use valida license composer value

* Add validation middleware and json api response factories

* Annotate validation and response factoring features

* Add travis config, use both supported ramsey/uuid versions

* Add badges

* Prepare v0.0.5

* Up changelog

0.0.4

Remove unused package

DTO from request, doctrine entities encoding support

0.0.3

Merge tag '0.0.2'

0.0.1

Fix release links