Commit 55 (Beta Candidate)

- New 'trigger' feature:
  Two-way data-linking now allows opting in to additional trigger
  events, so that data updates on every keyup event, as text is
  entered. This applies to data-linked inputs, textareas, and
  content-editable elements, as well as to custom tags, such as
  {{textbox}} which provide two-way binding through linkedElem.
  For example, setting <input data-link="name trigger=true" />
  means that updates to the name property will happen as you type,
  not just on leaving the textbox.

  See unit tests for full range of options on this feature.

- Many new unit tests

- Several minor bug fixes

- All samples updated to take advantage of new 'trigger' feature.