Merge pull request #459 from JohnnyEstilles/enhancement-cloudinary-replace-on-upload

adding cloudinary image replace on upload option
Moving options functionality into lib/core/options
Fixing issues with lib/core/mount.js
Cleaning up fieldTypes/cloudinaryImage.js
Fixing item.get(paths.exists) from #459
Cleaning up CloudinaryImage form.jade
Changing uploadReplace option to autoCleanup for #459
Switching default 'remove' button behaviour for #459

Now defaults to deleting if the `autoCleanup` option is true
Fixing initial sortOrder on a sortable List

When added a document to a list we should use max.sortOrder instead of
max.count to determine the initial sortOrder value.