Hook up spreadsheet and add event page

This PR:

- Adds `/events.html` 
 - has map showing all events, past are grey markers
 - adds monthly calendar showing all events
 - links to [spreadsheet](https://docs.google.com/a/github.com/spreadsheet/ccc?key=0AuOjlXjUrSbAdE1XRFJkeEJZQ1NSelhILUR0NXdBWUE#gid=0)
 - adds more js and css to do these things
- Connects `index.html` to a [spreadsheet](https://docs.google.com/a/github.com/spreadsheet/ccc?key=0AuOjlXjUrSbAdE1XRFJkeEJZQ1NSelhILUR0NXdBWUE#gid=0) 
 - only shows future events in list
 - links to events page
- Updates `host.html`
 - add section on adding your event to the spreadsheet

**`index.html`**
![screen shot 2014-03-29 at 2 10 37 pm](https://cloud.githubusercontent.com/assets/1305617/2559696/75e798ea-b787-11e3-8470-44ab8bb4670e.png)

**`events.html`**
![screen shot 2014-03-29 at 2 10 59 pm](https://cloud.githubusercontent.com/assets/1305617/2559690/67a9f070-b787-11e3-8360-b49e2fd13cd0.png)
![screen shot 2014-03-29 at 2 10 54 pm](https://cloud.githubusercontent.com/assets/1305617/2559692/6bf7db60-b787-11e3-8a3c-d323c7785367.png)

**`host.html`**

![screen shot 2014-03-29 at 2 11 13 pm](https://cloud.githubusercontent.com/assets/1305617/2559694/7230d00e-b787-11e3-83d5-5d830563f432.png)

**Other future neato things we can do**

- move geocoding task from the user-in-the-spreadsheet to the js-in-the-page
- dim color of past events in calendar 
- show or not show all events on map at one time
- clean up js and css a bit more (consolidate)

cc @muan because all the calendar awesomeness is hers.
cc @maxogden