Meteor has deprecated the `Handlebars` namespace.

Methods from `Handlebars` have been moved into `Spacebars` and/or `UI`.

Change-Id: Ida89a509bb33c6921c924bb4d0683fcc9426411b
Bug fixes and debugging related to 0.8.0.1 upgrade.

Change-Id: I714e5fcf0ecffd55771163a0cb9248bfaca9b8ed