Add specs

Get some tests up in here :+1: 

Found a few bugs on the way: 

* The delete command always returns a 400 error...
But that looks like a bug on opsview itself! :cry: 
http://www.opsview.com/forum/developers/opsview-api/correct-way-logout-after-finished-using-api

* The reload function doesn't return the response string (did a pending test for that)

* Reload function would be cool with a post command, so you can make the server reload the configuration automatically :+1: 

Not sure if you have a Travis account, I'd recomend it. It's free, and it's an easy way of getting CI for open source stuff :smile: