Strict escape II

Updated qooxdoo wrapper

- Cleaner separation of responsibilities in the code between
  scanning, parsing, compiling, and rendering functions.
- Much faster

Fixed a variable error in the documentation

This replaces the soft escaping ('&' -> '&') with strict escaping ('&' -> '&'). This new behavior matches that of Ruby and other Mustache implementations.

Other points:
- `dot_notation` currency is changed to use an ASCII character, since the JS interpreters did not appreciate unicode.
- Forward slash is added to escape list c/o OWASP recommendations.

Fixed a bug when context is a string

Add nuget spec for 0.5.x

Added MooTools compat plugin

The "send" function from the 0.4 API doesn't actually stream the template
so much as it just passes chunks of the rendered template through to the
callback as they are rendered. The callbacks are fired synchronously either
way, and using a "send" function just adds extra overhead and makes things
slower.

Fixes #156

Fixes #47