Import events from source URLs

[aaronpk]

I would love to be able to quickly "import" an event that lives at an existing URL. This would essentially parse the event URL and pre-fill the "add event" form based on the information it found there. Having a manual step to confirm the import is still useful, since it would give the person a chance to match up the city and venue to one that's in the system.

Here's the workflow that Calagator uses: http://calagator.org/sources/new

The simplest format to import from is Microformats since it's just a matter of using the Node.js Microformats parser to fetch the page and turn it into JSON, and won't require any API keys or other service-specific code.