added PayPal analytics and generated dist/ file

Added FPTI object and methods to send button usage data to PayPal anaytics platform. fpti.init() add handlers  to page load and button form submit events. The handlers trigger beacons which sends button data
Also you can help readability a lot here (and minor performance tweak) by extracting `getEntries` to a variable up top... like...
```javascript
var entries = window.performance && window.performance.getEntries(),
      duration,
      i;
if (entries) {
   for (i = 0; i < entries.length; i++) {
      ...
   }
}
```