Squashed:
Live HTML concept section, written before
finish template concepts
all new Meteor.ui API reference
minor wording
update examples in docs
fix remaining examples
fix broken links in docs
Meteor.ui.chunk example in docs
* remove() removes all documents in collection (previously, had to
explicitly pass {} selector to MM).
* update() requires {multi: true} to update multiple documents.
Previously we defaulted to true, now multi defaults to false.