* Implemented support for Play! 2.5.x / java8
* Added petstore sample for play25
* implemented play25 support
implemented version switch via playVersion config option
* fixed compilation failure after merge
* Disabled generation of CustomInstantDeserializer if dateLibrary equals to java8
* implemented core integration with play 2.4 ws
* added shell script to test on CI
* added shell script to composite file for all java generators
* added some comments
changed promise param to Response<T> to allow access to http status code and raw response if needed
* removed unnecessary whitespace changes
* added java7 compatibility, play ws deps to pom.xml
* added generated play24 client
* fixed imports