add remote track tests
added mercury certification test cases
Revert "added mercury certification test cases"

oops
This reverts commit d3475044a8b2f59f4bed279a8cfb42da11f7ba12.
added credit_card_track_data method
changed method name
Merge pull request #1431 from Shopify/firstdata_track_remote_tests

add remote track tests to firstdata_e4