Combine install-vtm.sh and install-vtm-android.sh into single script.

* Reduces build time
* Simplifies setup
Script install-vtm-native-libs.sh should clean up after itself.
One script to rule them all and in the darkness bind them.
Remove unused SDK components.
Update README.md
Merge pull request #159 from mapzen/chuck/simplify-project-setup

Streamline setup for dev and CI