CRM-12515: improving the credit card type in contribution forms.
CRM-12515: better credit card handling in contribution forms.
CRM-12515: add China Union Pay
Merge credit card icons into one sprint file, and use the term 'icon' instead of 'logo'.
Merge pull request #639 from mlutfy/cc-icons

CRM-12515: improve how credit card types/numbers are handled
worked on CRM-12515, fixed the icon button for offiline mode / when billing block is laoded via ajax
Merge pull request #672 from kurund/CRM-12515

worked on CRM-12515, fixed the icon button for offiline mode / when bill...
final clean up(CRM-12463)
more fixes