Set top position to (scrollHeight - this.$element.height() - offsetBottom).

#11464 - Fix JS noConflict mode - Refactor all plugins to use an internal reference to the jQuery plugin, because in noConflict mode you can never expect to be defined on the jQuery object

- Removed offending line causing a flicker to the default top state
- Simplified calculation of the top offset when in the bottom state

- Implements new format "Copyright 2011-xxxx Twitter, Inc.", which resonates well with our History page and more accurately reflects the copyright status of the repo
- grunt dist to update all the files

if affixed top add scrollTop to it position.top
calculate and cache pinnedoffset independent of scrolling for initial load

At the moment to make dynamic top offset calculator on multiple elements, one would write:

``` javascript
$('.my-affix').each(function () {
  var $el = $(this);
  $el.affix({
    offset: {
      top: function () { return $el.offset().top; }
    }
  });
})
```

This patch will allow to:

``` javascript
$('.my-affix').affix({
  offset: {
    top: function ($el) { return $el.offset().top; }
  }
});
```

Removes `window.jQuery` in favor of `jQuery`, fixes #10038