Update assertion of KVP.GetTile.Valid.Tile.Format
Update assertion of XML.GetTile.Valid.Tile.Format
Update assertion of SOAP.GetTile.Valid.Tile.Format
Update assertion of RESTful.GetTile.Valid.Tile.Format
Merge pull request #17 from lat-lon/image-png-failed-14

Update assertion of GetTile.Valid.Tile.Format