Update jquery.password.js

This change is to add some more configuration items:
 - Now you can set the strengthIndicatorBars your-self instead of using a hard-code one.
 - The minAcceptableScore is added so that people can config it them-self. It's default to 0.3 as the original code.
 Example of use:
$('#password').password({
        strengthIndicator: $('#progressBar'),
        strengthIndicatorBars: '<span class="pw_strengthIndicator"><span class="strength weak"></span><span class="strength medium"></span><span class="strength strong"></span></span>',
        minLength: 1,
        minAcceptableScore: 0.0,
        allowSpace: false,
        doubleType: $('#verifyPassword')
    });