- getting the php set up for sprites

We now determine the class and title before the link then apply it to
the link so that we can sprite the link instead of feeding the images in
directly.
- css to deal with the sprite states

This deals with the sprite states for feature :active and when it's not
featured.
adding the core sprite image
- space on the featured column

This just gives the feature column some more breathing room on the date.
whitespace clean up
Drop references to BraveNewCode Piggy app

Per Dan, they have dropped the product
More Piggy(Mobile) Cleanup

Also remove from list-table.php (props Andrew), and pull translation
strings from pot file
Merge pull request #463 from 1bigidea/drop-mobile

Brave New Code has dropped Piggy (iOS/Android Web App)
Merge pull request #456 from curtismchale/feature/417-featured-ui-improvements

Feature/417 featured ui improvements
Coupon Logic was returning true for all items

Dumb bug ignored all logic conditions and just returned true.
Merge pull request #469 from 1bigidea/hotfix/coupons

Coupon Logic was returning true for all items
Drop mobile.png

No longer used with drop of pig
Merge pull request #473 from 1bigidea/drop-mobile

Drop mobile.png (last bit of cleanup) props Andrew
UI fix so that 'Buy Now Button only...' text isn't overlapped by the metabox.
Avoid PHP warnings by correctly providing defaults
Merge pull request #483 from leewillis77/tax_warning_fixes

Avoid PHP warnings by correctly providing defaults
Fix performance of wpsc_get_child_object_in_terms

also updated code to standards
Renamed functuin
config file
Coding standard updates

Changed array cast,
Updated function header to include descriptions of parameters