Gradle / Android Studio support

Add gradle build support to storymaker and all dependencies. The project build process is substantially cleaner and now deterministic:

```
# add Flickr API keys to ./external/SecureShareLib/SecureShareUILibrary/res/values/flickr.xml>
$ git submodule update --init --recursive
$ ./gradlew assembleDebug
```

Alternatively you can simply import the root project directory into Android Studio. Unlike with the Eclipse build system, the entire dependency graph is represented within the build.gradle files. No "import projects in this order" or "set project A to depend on project B" configuration is necessary.

Removed Storymaker references to HoloEverywhere and Actionbarsherlock, and bump minSdkVersion to 14. There's some more work here removing HoloEverywhere from library dependencies before it can be completely severed.

Pardon the whitespace related changes in SceneEditorActivity : Can try to revert those if that confuses your review.