tracking of resized files, testing for src to filesystem
successfully deleting files by a path
moved resize file naming into its own method
successfully built the test for deleting images
revised tests to account for similar-named situations
getting pngs and gifs; adding letterbox features
reworked letterbox to more closely match resize
more cleaning of letter boxing so it matches resize and passes tests
completed image resize relative tests
Merge branch '117_image_resize_deletion'

* 117_image_resize_deletion:
  completed image resize relative tests
  more cleaning of letter boxing so it matches resize and passes tests
  reworked letterbox to more closely match resize
  getting pngs and gifs; adding letterbox features
  revised tests to account for similar-named situations
  successfully built the test for deleting images
  moved resize file naming into its own method
  successfully deleting files by a path
  tracking of resized files, testing for src to filesystem
changing site_url to home_url to match WP official recs