Minor readability improvements
Img module to abstract img writing and trying to mock out img writes
Merge branch 'master' of https://github.com/radvieira/img-crawler
Decided to not use mocks for testing because io is SUPER fast - pulled in img module back into main and did away with the img constructor function
Tests write to disk and clean on teardown.  Module reports img srcs (the path in the img tag) and the path of the file on disk
Merging write-to-disk branch