Add .projections.json
Add .projections.json

This configuration help plugins like vim-projectionist work. With this
file, I can now run `:A` in Vim to jump between the Ruby source file and the
spec file, making it easier to work with this project.

trotzig/import-js,trotzig/import-js,flarnie/import-js,flarnie/import-js,lencioni/import-js,trotzig/import-js,Galooshi/import-js,lencioni/import-js,lencioni/import-js