Installing plugins. #3

Plugins still need to be loaded from installed location.
Simplified test.
License.
Loading installed plugins.
Support zsh config files for setup. Fixes #4.
0.1.2
Refactor.
Refactor.
Fixed test so it always passes.
Removed utils.
Updated the way compatability is handled.
Ping Travis.
Disabled npm spinner.
Switched to caret.
The hook needs to be successful.
Added comment.
Updated rvm comment.
0.1.3
Removed before-cd hook.
Improved speed.