Add <If> Element

provides simplistic support for conditional inclusion of XML elements.

Use lxml; implement <Repeat>

See also README "Change Log".

v1.3.2

Allow XML elements to be created in Python functions.

Breaking change: Replace <Widget> with <Dummy>. Here's why.

v1.2.0

Recursive <Import>; better compatibility with clockwork.

Initial release

Initial release (1.1.0).