Merge pull request #33 from Tekco/master

Generate secure urls automatically
added transformation option DPR
add the possibility to add timeouts to api requests
Merge pull request #34 from MatthiasEgli/master

added transformation option DPR
Merge pull request #35 from ndparker/master

add the possibility to add timeouts to api requests
Fix return_error mode when calling api
Support width auto, dpr auto and responsive width
Support for background_removal parameter in upload and update
Fix tests to reflect prefix + direction=desc is not supported
Increment version to v1.0.18: Support for density pixel ratio (dpr) transformation parameter. Support auto width, auto dpr and responsive width. Support for background_removal parameter in upload and update. Upgrade jQuery plugin to v1.0.18. Support timeouts in API requests. Fix return_error mode when calling api. Allow user to override secure setting. Replace Exception with ValueError. Support auto-securing URLs if django request is enabled and the current page is being served over HTTPS.
Support custom_coordinates in upload, explicit and update, coordinates flag in resource details
Support return_delete_token flag in upload
Allow uploader.upload_image to work on raw files
add support for GAE. add sample GAE
Merge remote-tracking branch 'upstream/master'

Conflicts:
	cloudinary/utils.py