Transliterate the description for Payflow Link
Remove non-ASCII characters using gsub when transliterate isn't available
Fix Payflow Link tests for 1.8
Paymill: Change .com -> .de

This fixes an issue where card tokenization was failing in production.

Also uses the correct marketing form - PAYMILL - and adds some supported
countries.

Closes #672.
Add Payu_in as provided by them.
adding payu_in remote & unit tests
Payu_in: Major code cleanup to get the integration working properly.