Added UIMenuController "Copy" and "Save" actions on imageview

If the user preforms a long press on an active image, "Copy" and "Save" menu items will appear ("Save" only if permissible)

Screenshot:
![screenshot_save_copy](https://f.cloud.github.com/assets/1269283/2498805/83ccce70-b34b-11e3-8e6b-b047968764cd.jpg)