Added .travis.yml

This may not work the first time, I'll probably push directly if it
isn't happy for some reason. Need to get it in there to see though.
Added doc.go in console/test/ to fix build
script/test.sh: make work with gvm in travis-ci
travis.yml: make sure code coverage tool exists
travis.yml: fixed install of go cover tool
cmd test: fixed to handle console connecting to DB

This isn't very ideal; the console command (and thus also the crawl
command, since it starts a console) does not currently allow injecting a
mock DB, so we need to create the test schema for these tests to work.
We may want to rework it some.
README: added build status image
README: added godoc link
Merge pull request #42 from iParadigms/travis-ci

Added .travis.yml