Svgwrite

--------------------------

* BUGFIX: None checks: 'if value:' -> 'if value is not None:'

--------------------------

* BUGFIX: color accepts percentage values as floats like "rgb(10.2%, 3.78%, 20%)"

--------------------------

* BUGFIX: sign for offset-value wasn't optional

--------------------------

* BUGFIX: xml serialization for CPython 3.4.0

--------------------------

* simplified path parser
* pyparsing as external dependency (by jenselme)

--------------------------

* updated pyparsing for Python 3 to version 2.0.1 (prior version caused memory leaks)
* BUGFIX: utf8 to unicode encoding error for Python 2.7
* Tests for Python 3 require CPython3.3 or newer, using the 'u' prefix.