NEMO-1838 Spree 2.2/Rails 4 upgrade
NEMO-1838 Fix rake test_app.

These JS and CSS files are gone (moved to vendor),
so rake test_app was failing.

But besides, they already contained the lines that
were being added. So I'm just removing the code to
add those lines.
NEMO-1838 Fix specs.

Spree::Stock::Package::ContentItem now takes a line_item
as the first param.
NEMO-1838 Temporarily bump version.
NEMO-1838 Fix deprecated syntax.
NEMO-1838 For compatibility with Rails 3.2-generated migrations
NEMO-1838 Fix manifest file for assets
NEMO-1838 Specify rspec-rails version.
NEMO-1838 Remove TODO
Merge pull request #1 from PC/1838

1838 - Rails 4 and Spree 2.2