Added Facebook class provides 2 base methods for build request string for authentication via facebook.com and method for get AccessToken
Merge branch 'master' of https://github.com/ArtemZag/academy13 into maaak

Conflicts:
	BinaryStudio.PhotoGallery.Web/Controllers/AccountController.cs
Added base structure to socials networks
Added Facebook SDK package
Added Facebook as a Auth Provider Type
Refactoring: now Randomizer is a static class
FIX: correct links from social buttons
Added: overloaded method for IsUserExist
Added base structure of socials util classes
Added SignIN and SignUp from facebook(need refactoring)
Merge branch 'maaak' of https://github.com/ArtemZag/academy13 into maaak

Conflicts:
	BinaryStudio.PhotoGallery.Core/BinaryStudio.PhotoGallery.Core.csproj
	BinaryStudio.PhotoGallery.Core/SocialNetworkUtils/Facebook/Facebook.cs
	BinaryStudio.PhotoGallery.Web/Controllers/AccountController.cs
HOTFIX
Refactoring FB signIN
Added CreateAlbum method for facebook
Added realization for FB.AddPhotoToAlbum
Refactoring FB.AddPhotoToAlbum
Added FB.GetListOfAlbums
HOTFIX: all methods are static
Refactoring FB
Format field added for PhotoModel. ClenupTask refactoring.