add thumbnail entropy cropping and border removal
version bump
Don't crop if upscale is disabled and image is smaller than requested

This is useful because if the original image is smaller than the
requested one it is more handy to give size to the image container
with css instead of having another image. And with an horrible
background.

Since this is a change in behaviour so maybe a new setting is due.
Fixed THUMBNAIL_PRESERVE_FORMAT setting usage.
Merge pull request #226 from nschwane/master

Updated settings documentation with THUMBNAIL_URL_TIMEOUT setting.
Merge pull request #223 from metazet/master

Fixed THUMBNAIL_PRESERVE_FORMAT setting usage.
A better solution by radeinla for the pull request #223
A more verbose exception description
Trying to avoid exceptions by dowloading wheel packages from a nonsecure conection.
Disable wheel package for Pillow to get Travis working
Disabling all wheel packages
Getting original image dimensions by subclassing with the existing Image field from django. Related to #209
Subclass Image form field
Don't call LazyObject._setup() unconditionally; can be destructive.
Merge pull request #227 from carljm/safe-serialize-storage

Don't call LazyObject._setup() unconditionally; can be destructive.
Notice for developers
Django 1.4 compatibility. related #228
Include tests Django 1.4.10 (LTS version) rel #228
Fix travis-ci matrix
Fix travis-ci matrix indentation