[BugFix]Repush all the bound cloud applications during deleting one bound project

**Phenomenon of the Bug:**
- During the process of deleting a bound project in Package Explorer, it will trigger all the other bound cloud applications to be re-pushed. The user can't do nothing except waiting all the re-pushing are finished.

![issue8_triggerrepushboundcloudapplication](https://cloud.githubusercontent.com/assets/7316500/4556609/2f8fc10c-4ecb-11e4-8515-a709649c0ca2.PNG)


**Effect of the Modifications:**
- The re-pushing still exists during the process of deleting bound project, but a confirmation dialog, which asks the user to determine whether to re-push or not, will be presented for each bound cloud application.
 By this way, the re-pushing can be interrupted and canceled by the dialog rather than be unbreakable.

![issue8_repushconfirm](https://cloud.githubusercontent.com/assets/7316500/4556605/261c343e-4ecb-11e4-9037-22ce25c5b321.PNG)