Separated Constants from Keys. Also just deciding to implement ListingFragment and MainActivity enough so that I could test what returns from the server.
Merge branch 'listactivity' of https://github.com/therabbitmage/mightynarwhal into listactivity
Finished adding toString methods to both Listing Class and Link Class
Took out mEdited since it was causing problems. The "Edited" JSON properties was taken out because it serves a BOOLEAN or a LONG. I'll commit time later to find a perfect way to implement the edited properties into the parser so that it can read in a well. I have a reason to use it yet.

Built TestActivity to make sure that all the JSON data was coming in nicely. Going to remove it later or possibly just refactor the whole thing to make it do something else.
Merge branch 'master' into listactivity