#479 Web API requests / responses / models structure modifications
Merge branch 'dev-webapi' of github.com:devbridge/BetterCMS into dev-webapi

Conflicts:
	Modules/BetterCms.Module.WebApi/Models/MediaManager/GetFiles/GetFilesRequest.cs
	Modules/BetterCms.Module.WebApi/Models/MediaManager/GetImages/GetImagesRequest.cs
	Modules/BetterCms.Module.WebApi/Models/MediaManager/GetVideos/GetVideosRequest.cs