Added Boards.AddMember
Added second Board.AddMember method

provided default values for BoardMemberType params in AddMember
functions per the API (default type is Normal)
Added Boards.RemoveMember, async methods
Removed this when unnecessary

fixed issie with IBoard, IAsyncBoard method definitions (I left out the
default BoardMemberType param)
Added tests for Boards.{AddMember, RemoveMember}

Fixed some formatting to match the rest of the code
Changed the AddAndRemoveMember boards test

Since it broke the Search tests. Weird I know, but these are integration
tests and they're pretty brittle.