added a new project for tests into the workspace
added Kiwi for testing
added some test on creating operations
added test on engine's apiPath property
added OHHTTPStubs for network requests stubbing
added tests for calling completion blocks
adding request handlers once to OHHTTPStubs
Fixed a compilation error related to conditional compilation on Mac target
Added support for HTTP Patch
Network reachability moved to backgorund thread
Added a property that allows operations to run only on WiFi
Added support for client cert and server trust
Added support for client cert and server trust auth
Updated certs
Updated certs, again
Updated version and readme file
Cleaned up Demo code
updated instructions for installation via CocoaPods
Merge remote-tracking branch 'yas/adding-tests'
update Kiwi and OHHTTPStubs submodules to the latest versions