proposed implementation of pan and zoom
use maxDate instead of current Date as last x value
remove window.d = data
create PullRequestData class to handle data functions
pull out graph code to reusable chart class
update d3.js and add width method to timeline chart
Merge pull request #3 from joannecheng/joannecheng-refactor-javascript

Refactor Javascript
make unmerged pull requests lighter and a different color
remove zoom for now until it's fixed
make merged pullrequests stand out a bit more
move files into source folder
add middleman files
Comment timeline
Merge pull request #5 from joannecheng/joannecheng-comment-timeline

Comment timeline