Fix for issue https://github.com/hairballopolis/radiant-gallery/issues#issue/29,
Thanks to denny abraham
Fix issue 26 - uploading photos to a gallery fails on s3

  GalleryItem#create_item_infos uses Kernel#open with the s3_url rather than searching for the file locally

  https://github.com/hairballopolis/radiant-gallery/issues/issue/26
tag gallery:item:path uses path_to_image helper to generate url with asset server if set
removed inclusion of ActionView helpers, return all paths to image through helper
prevent Stack too deep error
fixed the URL issue for older versions
using exifr gem instead of including it
updated exifr as discovered things incorrectly included
removing support to < 0.9 radiant
Update public/javascripts/extensions/gallery/gallery/panel.js

the authenticity_token had the wrong name 
Merge remote-tracking branch 'upstream/master'

Conflicts:
	gallery_extension.rb