Link to downloads on S3

Since GitHub downloads have been killed.
don't reset localstorage, since we're not using it anymore
Add .event macro to models
Views can have multiple root nodes
Merge pull request #81 from elabs/multiple-roots

Views can have multiple root nodes
Don't add same class more than once in class bindings
Support document fragments in custom helpers
use childNodes over children
Properties can be cached, closes #54
Fix cache expiry on global events thingy
Remove old artifacts
Make first and last on collection into properties instead of functions
Refer people to site
Add an interface to safely dispose of views
twoWayBound called on controller
two way bindings use formatted values
Merge branch 'bound2' of github.com:maciejka/serenade.js into bound2