Enable bash completion test
Try to fix completion test
try to use script/ruby-test
Ignore wip tests
Speed up gem load time
Merge remote-tracking branch 'origin/master' into enable_bash_completion_test

Conflicts:
	.travis.yml
Merge branch 'master' into enable_bash_completion_test
Install bash-completion.
Install git's completion.
Add -a flag to be compliant with git.
Do not try to download the git completion script.
Let git to print all the commands when we pass `-a` to help.
Remove extra git path.
Make help a Git extension command

We could delegate all the flags back to `git-help`
Merge pull request #155 from jingweno/enable_bash_completion_test

Enable bash completion tests on Travis