Updating CONTRIBUTING.md as per Hydra v6.0.0

[ci skip]
Adding Hydra::FileCharacterization

Previously there weren't specs for ExtractMetadata
Merge pull request #11 from projecthydra/adding-hydra-file_characterization

Adding Hydra::FileCharacterization
Added version badge [ci skip]
Bumping to version 0.6.0
Fixing build
Restoring #to_tempfile

Other modules were dependent on the existence of this method.
At a future point, this method should be removed in favor of a more
generalized Conversion method Tempfile(object)
Merge pull request #12 from projecthydra/restoring-to-tempfile

Restoring #to_tempfile

This was blocking downstream development, so I'm merging.
Bumping to version 0.0.7
Adding badges!
Adding Railtie for initialization
Merge pull request #13 from projecthydra/adding-railtie

Adding Railtie for initialization. This allows an initializer to run without having to include `require 'hydra-file_characterization'`
Switch to streamio_ffmpeg for easier handling of ffmpeg arguments
Merge pull request #15 from projecthydra/replace-ffmpeg-cli-with-streaio_ffmpeg

Switch to streamio_ffmpeg for easier handling of ffmpeg arguments
Revert "Switch to streamio_ffmpeg for easier handling of ffmpeg arguments" This is being done becuase the gem does not support input parameters that are needed for video to jpeg and input format specification when the stream name does not contain the file extension.

This reverts commit 6f1afb5c61245fd6af511ce098d67bfb117f3817.
Merge pull request #17 from psu-stewardship/revert

Revert "Switch to streamio_ffmpeg for easier handling of ffmpeg arguments"