move grouped functions to separate files to reduce clutter in app.js
remove unnecessary require() for lodash and request in app.js
add require() for lodash back into app.js
move formatArtistInput function to its own file
move renderResults function to its own file called post_search_handler.js
add else if to handle error caused by artist search that begins with an non letter char
remove console.log test from error handler
reorganize separate files and requires to make app.js even smaller