Add branch out feature

running `co` will give you this prompt:

```bash
chjunior:agile_check_in/ (master✗) $ ruby -I./lib ./bin/co
Pair names (separated with '/') [chjunior]: chjunior
Story number (NA) [na]:
Story description [bug fix]: add branch out feature
M	lib/agile_check_in.rb
M	lib/agile_check_in/git.rb
Switched to a new branch 'chjunior/add_branch_out_feature'
chjunior:agile_check_in/ (chjunior/add_branch_out_feature✗) $ 
```