Adds js and css for making header sticky

reference -> AamAadmiParty/india-standalone-drupal#54
Change js for making stick only countdown part

reference -> AamAadmiParty/india-standalone-drupal#54
Change header's component

reference -> AamAadmiParty/india-standalone-drupal/#54
Change css for site header

reference ->AamAadmiParty/india-standalone-drupal#54
Make top-headet sticky

reference ->AamAadmiParty/india-standalone-drupal#54
Merge pull request #55 from tkuldeep/issue54

Issue54