Dont override Product#active

We should probably do some alias chain or just forget about this
override
Fix backend stylesheets placeholder
Fixes some missing translations.

Also add :sv locale and use correct locale for :fr.
Travis tests with different rubies.
Updated README and (c) year.

Also add badges for Travis and Code Climate.
Use bin instead of script folder for Rails4
Update dev dependencies + cleanup.
Fixes calling #sum with a block is deprecated and will be removed in Rails 4.1
Fixes tilt autoloading 'coffee_script' in a non thread-safe way warning.
Merge pull request #74 from futhr/master

Fixes some missing translations and correct some i18n issues etc.
Move pry-rails to Gemfile so we dont have to require it
Fix calls to Stock::Quantifier in AvailabilityValidator
- Spree 2.2.2+ Stock::Quantifier expects to be initialized with a variant and
  not a variant id
merge with origin repo to support spree > 2.2.2