Add __purge method for coverage. Update _log method to work with client side testing.
Add __purge method for coverage. Update _log method to work with client side testing.

mattikl/intl-messageformat,rlivsey/intl-messageformat,jeffvan576/intl-messageformat,mattikl/intl-messageformat,yahoo/intl-messageformat,rlivsey/intl-messageformat,ericf/intl-messageformat,rlivsey/intl-messageformat,jeffvan576/intl-messageformat,ericf/intl-messageformat,mattikl/intl-messageformat,ericf/intl-messageformat,jeffvan576/intl-messageformat,yahoo/intl-messageformat,yahoo/intl-messageformat