Merge pull request #23 from wileykestner/master

Upgrading to most recent version of Cedar and removed build warnings ...
add assert failures when fulfilling a promise more than once.
split network client into NSURLConnection and NSURLSession implementations
Merge pull request #25 from kseebaldt/assert_on_double_fulfill

add assert failures when fulfilling a promise more than once.
Removed KSURLSessionClientSpec and KSNetworkClientSpec from the main target
Merge pull request #26 from cbguder/master

Removed KSURLSessionClientSpec and KSNetworkClientSpec from the main target
Use passed in queue in KSURLSessionClient
Use the passed in session in KSURLSessionClient
Merge pull request #27 from cbguder/fix-session-client

Fix session client