Prepare for v.1.3 structure

[jphager2]

Sorry if the code is lame. If you have any suggestions for improvements, please don't hesitate. Also, I'm not sure how much you care about backward compatibility. The json parsing functions are available in vim8.

[josephan]

Would be awesome to have this merged. I love this plugin even if I just use it for the surround functionality in .eex templates!

Currently I've created .projections.json file with contents outlined in this blog post: https://thoughtbot.com/blog/supercharge-elixir-and-phoenix-navigation-with-vim-projectionist