merge from master

Tsi1.Api/Tsi1.BusinessLayer/Interfaces/IForumService.cs

Tsi1.Api/Tsi1.BusinessLayer/Interfaces/IMessageService.cs

....Api/Tsi1.BusinessLayer/Interfaces/IPostMessageService.cs

Tsi1.Api/Tsi1.BusinessLayer/Interfaces/IPostService.cs

Tsi1.Api/Tsi1.BusinessLayer/Interfaces/IUserService.cs

Tsi1.Api/Tsi1.BusinessLayer/Services/EmailService.cs

Tsi1.Api/Tsi1.BusinessLayer/Services/ForumService.cs

Tsi1.Api/Tsi1.BusinessLayer/Services/MessageService.cs

Tsi1.Api/Tsi1.BusinessLayer/Services/PostMessageService.cs

Tsi1.Api/Tsi1.BusinessLayer/Services/PostService.cs

Tsi1.Api/Tsi1.BusinessLayer/Services/UserService.cs

Tsi1.Api/Tsi1.BusinessLayer/Tsi1.BusinessLayer.csproj

Tsi1.Api/Tsi1.DataLayer/Entities/Course.cs

Tsi1.Api/Tsi1.DataLayer/Entities/Forum.cs

Tsi1.Api/Tsi1.DataLayer/Entities/ForumUser.cs

Tsi1.Api/Tsi1.DataLayer/Entities/Message.cs

Tsi1.Api/Tsi1.DataLayer/Entities/Post.cs

Tsi1.Api/Tsi1.DataLayer/Entities/PostMessage.cs

Tsi1.Api/Tsi1.DataLayer/Entities/User.cs

.../Tsi1.DataLayer/EntityConfiguration/ForumConfiguration.cs