Added Broadcast Discovery Stub

Find CSharp compiler again
updated iOS prebuilts for all architectures
More rigid checking of installer files
Fixes for CMake 2.8.11 on Windows 64Bit

Support for Android NDK 8b
Do not build Python bindings on Windows
Add threading support to python wrappers
Started with x86 support for android
Android x86 and fixed bug in um.s11n
osx build properties changed (python s11n chat example)
Merge remote-tracking branch 'upstream/master'

Conflicts:
	core/bindings/swig/python/CMakeLists.txt