add complete coverage and send it to coveralls

Can you please add the encrypted COVERALLS_TOKEN http://docs.travis-ci.com/user/encryption-keys/ or post it here so that I can include it in the commit

I know that the coverage via ginkgo/gover/goveralls looks way overdone but it is the only way I know to get coverage in one pass of all packages. So this should be safe for future additions.

I see that you currently upload the coverage via drone.io? So you like to switch from TravisCI?