run coverage tool

[jcarres-mdsol]

It would be cool this gem gives you coverage reports also.
But it seems that simplecov needs to be required in the env.rb or whatever helper file used in tests. How can we do that automatically in this gem?

[asmith-mdsol]

If we can't automatically hook in -- monkey patching the appropriate tools?! -- possibly we could add generator rake tasks that automate adding the hook code.