Deleted-and-ignored bin and obj files that shouldn't ordinarily be tracked
Added support for Instagram videos

 * Renamed InstaSharp.Model.Image to InstaSharp.Model.MediaObject
   and refactored accordingly
 * Moved InstaSharp.Model.Resolution into its own class file
 * New property InstaSharp.Model.Media.Videos of type MediaObject
Amended Mapper to use UTC DateTime objects.

 * Amended Mapper.UnixTimeStampToDateTime to use DateTimeKind.Utc
   instead of calling DateTime.ToLocalTime
 * Also called "Remove and Sort" on the using directives
Allowed Users...Recent to specify userID; removed redundant userID from Users...Feed

 * Private method RecentJson now takes an int? userID,
   which defaults to AuthInfo.User.Id if null
 * New overloads for public methods Recent, taking int? userID
 * Removed unused parameter user from private method FeedJson
 * Amended nullity checks within private methods to be more reliable
 * Amended String.Format within private methods to use String.Concat
 * Removed superfluous using directives.