We downloaded your Samurai sample project and it worked.
After uploading it to GitHub and building it with https://build.phonegap.com/apps the sample is not working anymore.
The building was successful but afterwards when we installed the apk package on the phone and started the app everything appeared very small and the button to open the camera didn't work...
I'm not quite sure which sample you are referring to. Would you mind providing a link to this Samurai project? I'm not aware that we have such a thing.