Merge pull request #62 from distracteddev/master

Add Options for Gravity and Fix s3 related ECONNRESET
Added support for multer (Express 4.x)

Added support for multer (Express 4.x)

multer stores the file type in file["mimetype"] and there is no headers.
Without the fix it would crash when using multer
Merge pull request #63 from distracteddev/master

Add a thumbnail option and accept other gravity options in resizeAndCrop
Merge pull request #64 from danpe/master

Added support for multer (Express 4.x)
Added thumbnail variants to prepareRemove function
Merge pull request #68 from sascha/thumbnail-delete-fix

Added thumbnail variants to prepareRemove function
Merge pull request #1 from madhums/master

Merge Upstream Changes