Merge pull request #811 from justinxreese/master

Disable autocomplete on bank account fields
Turn off autocomplete on credit card form

@justinxreese did this for the bank account form in #811 (and removed a
line break). This turns autocomplete off for the credit card form as
well (and brings back the newline :) ). It's a bit more secure.
Bump version to 7.3.24
Bump version to 7.3.24-dev