Update CONTRIBUTING for new github location and workflow
Delete exec_test.go
Delete exec.go
Delete export_test.go
Merge pull request #1 from bz2/contributing_update

Changes to the CONTRIBUTING doc and testing the bot as a side effect.
Update CONTRIBUTING
Rename README to README.md

So we get GitHub mardown rendering
on the landing page.
Merge pull request #3 from axw/readme-markdown

So we get GitHub mardown rendering on the landing page.
Merge pull request #2 from juju/test

test