fix: import path in example page
fix: import path in example page


 - it referenced 'ng2-material/all' instead of 'ng2-material' for the import module.
 - closes #239
Q-Free-OpenRoads/ng2-material,Q-Free-OpenRoads/ng2-material,Q-Free-OpenRoads/ng2-material,Q-Free-OpenRoads/ng2-material