Travis

(I left the git history to show basic travis vs travis w/ coverage, and also the workarounds to get Travis working on a fork.  Feel free to squash.)

This adds travis-ci support ([sample under maxlinc/gophercloud](https://travis-ci.org/maxlinc/gophercloud/builds/15407016)) and coveralls ([sample under maxlinc/gophercloud](https://coveralls.io/r/maxlinc/gophercloud)).

Note: Coveralls only works on Go 1.2.