[MonoIO] Updated README with better information
fix MonoIO sample build.

support-v4.jar is now in Mono.Android.Support.v4.dll.
SyncService requires empty .ctor(), so let java stub generator generate it.
ic_launcher.png disappeared at d00153b, so use icon.png instead.
fix build (as well as make it build on case sensitive filesystem).
update AdMob project: Use 6.3.0. Use EmbeddedJar. Remove obfuscation stuff from Metadata.xml.
make it build under case sensitive filesystem.
remove extra csproj that prevents batch build.
fix google play services lib path in add_play_services.sh.
remove support-v4.jar from ViewPagerIndicator.
fix AccelerometerPlay build.
pass arguments to xbuild so that we can easily run /t:Clean.
Updated the Maps & Location v1 README.