renames dropCol to match rest of group
adds incomplete insertChip method
adds updated HTML/CSS
Merge branch 'master' of https://github.com/Cheerazar/connect_four_js
added chips

Merge branch 'master' of https://github.com/Cheerazar/connect_four_js
moves controller code to controller file
links controller.js on html file
Merge pull request #9 from Cheerazar/controller

Controller