updated jquery javascript, css and images

updated jquery.ui javascript, css and images to use datepicker
used jquery.ui datepicker

updated common helper, form and used jquery.ui datepicker for published at
move javascript order. add integration spec

moved javascript method order. add integration test for
datepicker. changed common helper to use Date.today
remove datepicker cucumber
add integration test for datepicker
title should be passed in create_a_blog_post method
Merge pull request #26 from xskander/feature/jquery_datepicker_r3

Feature/jquery datepicker r3