Expose private nested types that are exposed in public API. (#316)

In Xamarin.Android we fixed an issue where private nested classes were getting unintentionally bound. However, thanks to Java's lax rules regarding visibility, you can reference those classes in public API. C# does not allow you to do this, so you need to expose the class as public so it will be bound and thus usable.

This updates 2 samples that were relying on exposing private nested classes to explicitly mark then as public via metadata.

Author: jpobst

OsmDroidBindingExample/OsmDroidBinding/Transforms/Metadata.xml

@@ -23,6 +23,8 @@
 	<attr path="/api/package[@name='org.osmdroid.tileprovider']/class[@name='MapTileProviderBase.ScaleTileLooper']/method[@name='handleTile']" name="visibility">public</attr>
 	<attr path="/api/package[@name='org.osmdroid.tileprovider']/class[@name='MapTileProviderBase.ZoomInTileLooper']/method[@name='handleTile']" name="visibility">public</attr>
 	<attr path="/api/package[@name='org.osmdroid.tileprovider']/class[@name='MapTileProviderBase.ZoomOutTileLooper']/method[@name='handleTile']" name="visibility">public</attr>
+	<attr path="/api/package[@name='org.osmdroid.views']/class[@name='MapControllerOld.CosinusalBasedAnimationRunner']" name="visibility">public</attr>
+	<attr path="/api/package[@name='org.osmdroid.events']/class[@name='DelayedMapListener.CallbackTask']" name="visibility">public</attr>
 	<!-- Draw() seems to be public for android so we need to be consistent about it.  C# doesn't like to mix visibility during inheritance. -->
 	<attr path="/api/package[@name='org.osmdroid.views.overlay']/class[@name='Overlay']/method[@name='draw']" name="visibility">public</attr>
 	<attr path="/api/package[@name='org.osmdroid.views.overlay']/class[@name='TilesOverlay']/method[@name='draw']" name="visibility">public</attr>

android5.0/GoogleIO2014Master/AndroidSvg/Transforms/Metadata.xml

@@ -27,5 +27,6 @@
   <attr path="/api/package[@name='com.caverock.androidsvg']/class[@name='SVG.TextContainer']" name="visibility">public</attr>
   <attr path="/api/package[@name='com.caverock.androidsvg']/class[@name='SVG.SvgConditionalContainer']" name="visibility">public</attr>
   <attr path="/api/package[@name='com.caverock.androidsvg']/class[@name='SVG.SvgElement']" name="visibility">public</attr>
+  <attr path="/api/package[@name='com.caverock.androidsvg']/class[@name='CSSParser.AttribOp']" name="visibility">public</attr>
 
 </metadata>