Updating all resources to use HTTPS.

Love the gem, it is really handy, but I noticed that it sometimes uses http and not https even when the server is running over https. 

For most people this might not be a problem, but for me it ruins my beautiful green lock in the url of my webpage.

I found a quick patch which was to simply use https by default. I have not found any instance where this does not work, but it can be smart to verify that all works as advertised.

Keep up the good work :)