Adding support to export colors/themes for Android
It would be cool to be able to export Colors/Themes/Styles for Android-Apps.
Colors are defined in xml.

Sample:

```xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
	<!-- colors for AppTheme.Blue -->
	<color name="colorPrimary">#3F51B5</color>
	<color name="colorPrimaryDark">#303F9F</color>
	<color name="colorAccent">#FF4081</color>
	<!-- colors for AppTheme.Red -->
	<color name="colorPrimaryRed">#F44336</color>
	<color name="colorPrimaryDarkRed">#D32F2F</color>
	<color name="colorAccentRed">#607D8B</color>
	<!-- colors for AppTheme.Green -->
	<color name="colorPrimaryGreen">#4CAF50</color>
	<color name="colorPrimaryDarkGreen">#388E3C</color>
	<color name="colorAccentGreen">#795548</color>
	<!-- colors for AppTheme.DarkOrange -->
	<color name="colorPrimaryDarkOrange">#FF9800</color>
	<color name="colorPrimaryDarkDarkOrange">#F57C00</color>
	<color name="colorAccentDarkOrange">#9E9E9E</color>
	<color name="black_overlay">#66000000</color>
</resources>
```