should be able to reset the simulator content and settings

## motivation

- [x] @krukow needs review

The applescript implementation was not working for iOS 6.1 - the 'Reset' button was not touched.  This script also installed "EmptyAppHack.app" on each of the available iOS SDKs which was very strange.

The reset can be done without the UI.

```
      # resets the simulator content and settings.  it is analogous to touching
      # the menu item.
      #
      # it works by deleting the following directories:
      #
      # * ~/Library/Application Support/iPhone Simulator/Library
      # * ~/Library/Application Support/iPhone Simulator/Library/<sdk>[-64]
      #
      # at the next launch of the iOS Simulator these directories will be
      # recreated.
```

This is a little controversial:

* we are deleting files from the user's drive
* it is not clear that this will work on future versions of Xcode

I actually think that this command should be deprecated.

Let another tool (like briar, ios-sim, or xctool) handle this.  I don't believe that this is essential to the calabash-ios workflow.

**UPDATE:**  Now that have encountered the phenomena of TMUX + calabash destroying the contents of ~/Library/Application Support/iPhone Simulator/ (see https://github.com/calabash/calabash-ios/issues/308), I am much more confident that this strategy of deleting the app support directory is the right thing to do.