Add countdown.coffee script to set and retrieve countdown
Add countdown.coffee script to set and retrieve countdown

It helps to set countdowns for upcoming events. See how many days
are remaining for the event.

marksie531/hubot-scripts,jan0sch/hubot-scripts,wsoula/hubot-scripts,ambikads/hubot-scripts,opentable/hubot-scripts,GrimDerp/hubot-scripts,sklise/hubot-scripts,davidsulpy/hubot-scripts,MaxMEllon/hubot-scripts,github/hubot-scripts,iilab/hubot-scripts,dhfromkorea/hubot-scripts,phillipalexander/hubot-scripts,terryjbates/hubot-scripts,arcaartem/hubot-scripts,justinwoo/hubot-scripts,zecahnin/hubot-scripts,azimman/hubot-scripts,yigitbey/hubot-scripts,n0mer/hubot-scripts,alexhouse/hubot-scripts,ericjsilva/hubot-scripts,chauffer/hubot-scripts,ryantomlinson/hubot-scripts,jankowiakmaria/hubot-scripts,contolini/hubot-scripts,Ev1l/hubot-scripts,cycomachead/hubot-scripts,jacobtomlinson/hubot-scripts,modulexcite/hubot-scripts,magicstone1412/hubot-scripts,dbkaplun/hubot-scripts