fixed naming mistakes in Payment Entity spec, added credit card form type, added credit card brands, added services for credit card
added spec for credit card entity
correct copyright and author info in CreditCard type
add author email
add credit card validation and english validation methods
fix spacing, remove irrelevant comments
fix copyright owner and authorship on credit card form type
ran php-cs-fixer on all edited files that returned errors
removed unnecessary locale from CreditCardType, moved CreditCardType class to services.xml
remove unused Options use statement
made get years function private, moved to end of file
Merge pull request #8 from Eponymi/credit_card_form_branch

Credit card form branch
Converted translations to xliff format
Merge pull request #11 from umpirsky/feature/translation-yml-xliff

Converted translations to xliff format
Merge remote-tracking branch 'upstream/master'