Added World Weather Online as a service, and a few minor tweaks

[sebj]

I added World Weather Online as an available weather service, and updated one or two comments to be more descriptive/correct. I made the changes a while ago, but forgot to create a pull request and all.

I've also merged the latest changes from your master branch back in, of course.

[sebj]

Also, the Travis build status is curious.. Looking at the log/details, everything seems to actually be fine with tests passing, except for some strange +[SimDeviceSet defaultSet]: unrecognized selector sent to class 0x10cb65280 message.

[comyar]

Awesome! Let me look into the Travis build status...I'll merge as soon as possible.

[comyar]

So I don't think the tests are failing because of any code on our end, I think it may just have to do with xctool and Travis CI. I'm going to mess around with it and see if I can get the tests to pass. I went ahead and merged your changes.

Others are having the same issue here

[comyar]

Alright, so I got the tests to pass by forcing Travis to update homebrew and build xctool from source before the tests. Check the .travis.yml if you're interested in seeing the changes.

[sebj]

Ah, wow. Thanks for merging!