Fix autocomplete issue in customer details with latest jquery UI

Fixes #2408
Fix issue where single quotes would break taxonomies/get_children response

Fixes #2413
Ensure option values in Variant#options_text are sorted in a predictable order

Fixes #2432
Show TravisCI badge for 1-2-stable branch
Reject instead of deleting months from the localization list

The %B date formatting operator relies on nil for the first month
in the month_names array. Deleting it from I18n will cause month
shifting

Fixes #2427
Freeze to jquery-rails 2.1.4 as jQuery 1.9 breaks a plugin
edited admin/shipping_methods.js to be more explicit when manipulating checkbox inputs so that additional checkboxes are not affected

Fixes #2465
Fix duplicate result if name contains SKU