This is 2012, assume we already have UTF8

There are conversion functions scattered around that assume text is
ISO-8859-1, and does conversion to UTF-8. PHPWord should assume text is
already in UTF-8, and let calling applications do charset conversions if
required.

Conflicts:
	src/PHPWord/Section.php
Example UTF-8 encoded string output

Chinese characters taken from: http://phpword.codeplex.com/discussions/261365