Merge pull request #69 from silky/master

'days away' post and github stickers picture.
Added hashtag on the webpage
Merge pull request #70 from astrokatie/patch-1

Added hashtag on the webpage
Update index.html
Changed "Why you should attend" paragraph
fixe typo
Fixed all typos
Merge pull request #71 from antbbn/master

Changed "Why you should attend" paragraph
converted to post-conference mode. fixes #74