Tiled 1.0.3

• Fixed crash on reload map (#1659, #1694)
• Fixed possible crash on undo/redo in collision editor (#1695)
• Fixed tile replacement to add tileset when needed (by Mohamed Thabet, #1641)
• Fixed the display of the image source property for tilesets
• Fixed shortcut for 'Copy tile coordinates' (Alt+C) in Portuguese translation (by olueiro)
• JSON plugin: Fixed reading of tileset column count
• JSON plugin: Fixed reading of custom properties on tile collision object group