Fixed Gradle resource processing issue - Error: No resource found that matches the given name: attr 'switchStyle'

Fix was found on StackOverflow http://stackoverflow.com/questions/19625529/gradle-error-when-theme-declare-styleable-in-two-libraries

Try changing this
```xml
<declare-styleable name="Theme">
        <attr name="switchStyle" format="reference" />
        <attr name="switchPreferenceStyle" format="reference" />
</declare-styleable>
```
to this:
```xml
<declare-styleable name="AppTheme">
        <attr name="switchStyle" format="reference" />
        <attr name="switchPreferenceStyle" format="reference" />
</declare-styleable>
```