Because CocoaPods just support Swift and framework recently,
please use sudo gem install cocoapods --pre to install the
prereleased version to try.
We haven't upload the podspec, will do this after legal review
and the CocoaPods' framework feature gets ready.
Demos/Sample/Podfile is a way to verify the usability of the
crosswalk-ios pod, and we haven't convert the project file to adapt
to the CocoaPods way, will do it asa podspec get upload.
NOTICE:
sudo gem install cocoapods --pre
to install the prereleased version to try.