adding remove_metadata_field helper function and the remove_field method it calls. allows us to dynamically control which meta fields a users is displayed based on another value. ide removed trailing whitespace. fixed call to wp_parse_args where parameters were backwards.
returning bool for method remove_field on success/failure
Merge pull request #3 from voceconnect/remove_metadata_field

adding remove_metadata_field helper function and the remove_field method...