Insight-reloaded

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* Fix typo on cropped image name

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* Add test for file system storage
* Rename NFSStorage to FileSystemStorage
* Fix bug in content-type header processing, do not append a tuple
* Add dynamic import using some circus code
* Add boto to requirements
* Remove post_process method of Storage. Make crop works with S3 Storage
* Add working S3 storage
* Beginning of storage refactoring

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* Update for callbacks on new tornadoredis version
* Give more informations on json.loads error

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* Add tika mimetypes for ooxml preview
* Display error on stderr even if it is send to the callback

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* Auto restart worker even if it fail.
* Accept invalid SSL on callback

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* Close before the abort
* Remove the deprecation on exception.message