Added missing analyse finished event.
Fixed unittests with symlinks.
Changed download mimetype to octet-stream.

Not force-download, which is not a valid mimetype.
Cleanup of blackstill test.
Fixed -vf bug with non fitting size.

Added a -vf scale filter in case of requesting an destination of smaller
size. Also added the -vf yadif filter to handle deinterlace (was
deprecated). Fixed for videos transcoding and image generation by
ffmpeg.
Added a drupal_alter for asset xml enrich.
Removed a mediafile exists check.

This will allow for jobs that do not depend on a single mediafile.
Fixed unittests with asset/id/still.
Merge pull request #129 from arjenk/bugfix-add-rule-action-analyse

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Merge pull request #130 from arjenk/feature-hook-asset-response

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Merge pull request #131 from arjenk/bugfix-ffmpeg-vf-parameter

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Merge pull request #132 from arjenk/feature-job-remove-mf-exists-check

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Merge pull request #133 from arjenk/bugfix-unittest-stills

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Merge pull request #134 from arjenk/bugfix-unittest-symlink

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Merge pull request #135 from arjenk/feature-download-mimetype

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Merge pull request #136 from arjenk/bugfix-blackstill-test

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Version 3.5.1-dev build 2101.