Prefix talks with date

I _really_ like arbitary conventions.

But in all seriousness, this makes it much easier to parse and scroll
through this rapidly lengthening list of talks. QED.
Merge pull request #13 from danielfone/iso8601

Prefix talks with date
Organise talks into years, switch to Middleman Blog
Merge pull request #15 from nzruby/remove-date-frontmatter

Organise talks into years, remove date frontmatter dependency
Publish future-dated talks
Giant README link