SEO related updates - added rel next/prev to category view
Merge pull request #130 from naro/master

Emit application/json mimetype for all JSON responses
added cart-updated event and updated upgrade notes
add safeparsejson to lfs_tinymce
fix ajax upload for attachments
fix image upload
moved image upload JS to script file from template
fix user lookup
refactored global images
default as empty string
css3 prefixes
added filtering to imagebrowser dialog
use compressor for product js
use filter params in pagination
added current option to customer panel
handle nonexisting cart
fix issue #5 from django-buildout-development
fix issue with incorrect date format
reload filter in management panel while filtering, add state parameters to filter view
fix image inserting