sanity refactor with callbacks
avoid ECMAScript 5 properties for compatibility
pagination for gcontacts
extra info on pagination && timeoutSession

 - pagination moved to an object with extra information
 - removed window._GcontactsTokenTimeout in favour of
   timeoutSession variable inside the library
 - internalRandomCode complex than only numbers avoiding
   errors on square brackets use over jsonp callback
Merge pull request #5 from eventioz/callbacks_and_pagination

Callbacks and pagination