rename repo to hopefully prevent delete

cc @hone02 please don't delete or rename repo: rails3-hatchet-dev
Gemfile.lock to .gitignore
Change git repo to public url for Travis

Travis complains about cloning from git repos since it doesn't have github.com as an authorized source. Changing to http://about.travis-ci.org/docs/user/build-configuration/#Use-Public-URLs-For-Submodules for now to solve problem. 

Gets us around this problem: 

```
Installing repos for hatchet
==  Did not find git@github.com:sharpstone/git_gemspec.git in ./repos/bundler/git_gemspec, cloning
The authenticity of host 'github.com (204.232.175.90)' can't be established.
RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
Are you sure you want to continue connecting (yes/no)? 
```