show attachments horizontally and allow repositioning
show spinner when uploading
ajax delete
fix rails executables
attachment: max position within scope
Merge branch 'sortable-attachments'

Conflicts:
	attachments/app/assets/javascripts/brightcontent/attachments.js
	attachments/app/controllers/brightcontent/attachments_controller.rb
	attachments/app/models/brightcontent/attachment.rb
	attachments/app/views/brightcontent/attachments/_attachment.html.erb
	attachments/app/views/brightcontent/base/_form_field_attachments.html.erb
	core/app/assets/stylesheets/brightcontent/main.css
merge artifact
migrate dummies
fix paperclip to last known working version (4.0 support is WIP...)
set position before create instead of save
dummy doesn't need these migrations
fix specs
some specs to describe Attachment.reposition!
Merge pull request #26 from brightin/sortable-attachments-b3

Sortable attachments
Paperclip 4 support: enforce content types for attachments (closes #27)
attachments UI bugfixes
Use official Bootstrap sass port (closes #28)
refactor fields definition
added 'attachments' list field implementation
Camelize instead op capitalize resource names in the controller template.
add a hook to put things in the <head/>