Extract Method refactoring(Ronak Patel 6483607)

This refactoring is done in the Server.model package in the class named
inGameController.java.
Extract Superclass Refactoring(vishal  6424250)

This refactoring is done in the server.Model package.
Extract class(hardev 6446019) Long Method(Navrang 6447430)

This refactoring is done in the server.model package in serverPlayer
class and a new class serverConnection is created as extracted class
Merge branch 'master' of https://github.com/vishal-mittal/SOEN6471_FreeCol_MileStone4