Refactor Importer#import
Refactor Importer#import

I'm making room for a method that will allow you to import all variables
from a file. Breaking out the meaty part from Importer#import will help
prepare for this new feature.

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