Update .gitignore

Improve .gitignore

* Ignore OSX specific files
* Ignore Windows specific files
* Ignore Linux specific files
Added stats projects and associated tests
Guillaume : Premier push des controllers User et ApiUser
Merge branch 'feature_profiles' of https://github.com/aspNetIng3/Youp into feature_profiles

Conflicts:
	YoupFO/Controllers/UserController.cs
	YoupFO/YoupFO.csproj