Updated Android build configuration.

git-svn-id: http://svn.purei.org/framework/trunk@451 6a6d099a-6a11-0410-877e-d5a07a98cbd2
Use libc++ instead of libstdc++ on Android.

git-svn-id: http://svn.purei.org/framework/trunk@452 6a6d099a-6a11-0410-877e-d5a07a98cbd2
Update Android build config.

git-svn-id: http://svn.purei.org/framework/trunk@453 6a6d099a-6a11-0410-877e-d5a07a98cbd2
use nuget for all 3rd party dependencies
Merge remote-tracking branch 'upstream/master'