* Remove AST in favor of pure Pyhon. This should make it easier for
developers to understand and create new directives because they do not
need to know AST.
* Remove `t-call-options` as it has been merged into `t-options` for more
consistency. Support for t-call-options is retained.
* Use generators for lists. This increases performances as the rendering
can be sent directly without having to wait for the creation of the
entire list.
* Optimize expressions runtime computation by pre-computing the static
parts.
Example:
'<' + 'div' + '>' + '<' + dynamic_value + '>'
Now compiles as:
'<div><' + dynamic_value + '>'
Gorash
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