updated spree dependencies to 1.3.1
merged prawn 1.0
update spree dependencies
update admin orders controller decorator

store/restore current locale
add preferences in configuration model

print_buttons default 'invoice'
page_size default LETTER
page_layout default landscape
update override buttons
update prawn views

keep address
update invoice, packaging_slip
remove others
update locales

english and french default
add javascript file to handle language selection

update buttons links according to language selection
remove PDF mime type duplicated in Rails 3.1
add install generator

append  javascript asset file in spree admin all.js
updated
updated error in buttons partial commit

added html code
updated address partial

removed bounding box in partial
removed address partial

doesn't run well with prawn graphic state
Add gitignore file.
Add BSD license file.
Refactor engine for Spree 2.x.
Major cleanup and Spree i18n namespace.
Spree namespace to locales.