Use the preview property to store and retrieve the image previews. Fixes #2592
Fixed file upload error handling.

Thanks to Daouda Kanoute for the report.
Added imageOrientation parameter to define the orientation for resized images.
Moved the core file input styling into separate files.
Don't use CSS imports. Closes #2610
Updated Bootstrap Links, Icon info and Gallery version. Closes #2622
Updated file input button style to accomodate larger file selection buttons.
Updated file input styles. Fixes #2635
Apply file upload style fixes to IE < 8.
Use dataType option for DELETE requests. Closes #2638
Adjusted tests for the dataType usage.

Updated jQuery for the test page.
Allow reenabling the submit button in the submit callback. Closes #2639
Updated Gallery requirement.
Updated package versions.
Allow configuration of iframe src attribute
Create new event objects for each fileupload event trigger.

The original jQuery event can be accessed as delegatedEvent property.
Support preventDefault on the event callbacks to disable default behavior. Closes #2651
Merge pull request #2652 from bmwyant/master

Allow configuration of iframe src attribute
Merge branch 'master' of github.com:blueimp/jQuery-File-Upload
Added new initialIframeSrc option, based on pull request #2652.