support showing download progress for OkHttp
refactored a little bit to allow registration of callbacks
added facade interfaces
added to iOS Network Handler
updated build process to support changes in OkHttp proj
added a missing exception from the facade
updated the facades
style fixups
apparently WeakReferences for delegates don't work in MonoTouch
pull the content-length from the headers
added progress bar to test app
reworked Makefile the vendor folder was keeping the vendor event from running in the Makefile
Merge remote-tracking branch 'origin/pr/60'
Only throw if we have set throwOnCaptiveNetwork
Fix cancellation in our tests by rigging SendAsync correctly
Style
Merge branch 'progress'

Conflicts:
	src/ModernHttpClient/Facades.cs
	src/ModernHttpClient/ModernHttpClient.iOS.csproj
	src/ModernHttpClient/iOS/NSUrlSessionHandler.cs
Version bump to 2.0.0
Make the facades a no-op on Windows platforms, so they don't troll PCL authors
Add Portable target to Makefile