More dynamic info about contributors.
Add call to sort_packages and method placeholder
Check parts stock in Stock::AvailabilityValidator

Since https://github.com/spree/spree/commit/fcb4293046208a05dd9b281b1d767d588550b904
stock is no longer checked within OrderPopulator so we need to check for
parts stock on line item validation which uses
Stock::AvailabilityValidator in turn
Bump rspec-rails 2.14.0
Cleanup specs and make them pass.
Cleanup spec_helper and revert to use shared connection.
Minor tweaks for js.
Updated readme from commit #5223300