Use wp_enqueue_script instead of wp_print_scripts to enqueue js for the front end

Hey buddy,

Nice to chat with you yesterday. I'm looking at the code to see how I can communicate some of the things I talked to you about yesterday through code - it's easiest to see what I'm talking about in code.

This particular change makes the code slightly better in my opinion, so accept pull request if you agree.

Cheers!