Adding input and output options to ffmpeg and video processor so we can generate video thumbnails and pass other ffmpeg input parameters
RESOLVES #18
Added ImageMagick dependency
Updated FITS URL
Merge pull request #20 from dchandekstark/readme-update

Added ImageMagick dependency
Merge pull request #21 from psu-stewardship/video_thumb

Adding input and output options to ffmpeg and video processor so we can ...
Correcting Railtie initializer

Fixes #24
Merge pull request #25 from projecthydra/fixes-24

Correcting Railtie initializer