Coyote Lumberton Newfoundland

This fixes #21 with images previews not showing up in the back end page to see cached files.

also includes the following changes and fixes:

• adds missing magnific css 203ccb2
• fixes #22 adds image path to button to create images a5d6231
• fixes #23 fragile version strategy 7a84b60
• adds use of url_generator to generate path to prime page in the cached files page dd458e8
• adds data-attribute to get branding path if its customized in config & updates js 1b6c869
• uses url generator to get admin path for customized branding paths 8dfb717
• updates js for customized branding paths 36ff622
• adds docs section on Animated Gifs 69255c6
• adds 'imagemagick' to expected drivers 6edd796
• adds the proper imagick/imagemagick setup to config.yml.dist 11d9063
• Fixes to #21 dd1b9c1 280c9ec 6272d0d