Title Overlays and Bug Fixes

So I had globally disabled GitHub notifications, and some pull requests went unnoticed until, well, 2 days ago. I merged all three pull requests, two from edigiacomo and one from orzarchi. Special thanks to those two users. What's added in this version:

• Title overlays! Have ImageMagick directly place the title of the image on the background itself, no conky required (but always an option). It's disabled by default, check out the example config and the "Title Overlays" section in the readme. Thanks to edigiacomo for the base work, I personally added a few small config and style changes.
• Dropped curl dependency, thanks to edigiacomo. I did not know that urllib had a function to get only the first 10k of an image, which is why curl was specifically used.
• Speaking of dependencies, orzarchi added in dependency checks. The program should now alert users without imagemagick installed.
• Fixed some bad programming that would search printed json files instead of properly parsing them. It was originally pretty hacky, but I have since learned the basics of Python dictionaries. This shold make the code more robust, and I'm pretty sure it fixes bugs with older versions of Python 3.