~/floorc.json

This is a big change in how our plugin config works. Instead of reading config options out of ~/floorc, we now read them from ~/floorc.json. If the json file doesn't exist, we migrate the user's settings (but without removing the old floorc). 

Another big change: Multiple auth credentials. It is now possible to specify credentials for floobits.com and any other instances. (This is handy for enterprise customers and for dev/testing). 

This still needs some more testing and cleanup before merging. We'll also need to port these changes to Vim and Emacs. *Then* we'll need to change flootty, floomatic, and the IDEA plugin. It's probably best to release all this stuff around the same time. Otherwise different tools could end up reading different versions of the config file.