Commit 53 (Beta Candidate)

New features and improvements
- observe()/unobserve() and observeAll()/unobserveAll() now
  support namespaces. Pass one or more (whitespace separated) namespaces
  as first parameter (where a namespace is as in jQuery events and can
  include dot-separators: "aaa.bbb.ccc"). Documentation to follow, but
  see unit tests for examples

- In JsViews, invalid syntax using {{}} tags within element markup is
  now detected, with a specific error message.

Bug fixes:
  https://github.com/BorisMoore/jsviews/issues/249
  https://github.com/BorisMoore/jsviews/issues/250
  https://github.com/BorisMoore/jsviews/issues/251
  https://github.com/BorisMoore/jsrender/pull/236

- Fix for disposing contained bindings in some (unusual) scenarios when
  updating tag controls within element-only content.