2.0: Reduce offset module

<pre>
Sizes - compared to master @ 50290b8ffb05c504d3866a619f282bf795bc01f6
    235320      (-286)  dist/jquery.js                                         
    125115      (-119)  dist/jquery.min.map                                    
     82568      (-101)  dist/jquery.min.js                                     
     29508       (-40)  dist/jquery.min.js.gz 
</pre>