Merge branch 'master' of github.com:ractivejs/docs.ractivejs.org into 0.8-updates

Author: evs-chris

docs/edge/Migrating.md.hbs

@@ -50,6 +50,8 @@ You can now retrieve the CSS for a Ractive instance with a new `toCSS` method. Y
 
 * The private `_ractive` tracking data added to Ractive controlled DOM nodes has changed significantly. The format of `Ractive.getNodeInfo` objects is still compatible.
 
+* `\{{#with obj}}` to not render if `obj` is falsey (https://github.com/ractivejs/ractive/issues/1856)
+
 ## Migrating from 0.6.x
 
 ### What's new