provide a deploy to openwhisk button for github

create a github button to allow deployment of attached project from github to openwhisk - this can itself bootstrap openwhisk - similar to the deploy to bluemix button available today.

this feature may be better suited for the wskdeploy repo; thoughts @paulcastro? FYI @ddragosd.

The issue proposes a GitHub deployment button for sending an attached project to OpenWhisk, similar to the existing Bluemix button. Start by examining how the Bluemix button works and whether this belongs in the wskdeploy repository; done means the button can deploy the project and bootstrap OpenWhisk.

Written by the indexing model from the issue text.