Support for tab stops in Word 2007 documents

Also, provides a new example file TabStops.php that gives a brief
example of how to use the new tab stop feature.
Support for indentations in Word 2007 documents

Also, provides a new example file Indentations.php that gives a brief
example of how to use the new indentation feature for both paragraphs
and lists.
Support custom numbered lists in Word 2007

Provides an example of new numbered list creation. Most of the examples
were taken from this source link:
http://msdn.microsoft.com/en-us/library/office/ee922775.aspx#odc_Office14_ta_WorkingWithNumbering_Overview

The new custom numbered list generation is achieved by providing a new
API that creates the numbering.xml document dynamically.

These changes break the legacy ListItem generation API.
Sections can support multiple headers

Each section can now have a single header (previous behavior). It can
now also support multiple headers. The spec defines three types of
headers: default, first, and even. These code changes provide support
for all three.

The HeaderFooter.php example has also been updated to illustrate how to
use the new multiple headers for a section.

Used these pages as spec reference:

http://www.schemacentral.com/sc/ooxml/e-w_headerReference-1.html
http://www.schemacentral.com/sc/ooxml/a-w_type-4.html
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
Provide a method to convert measurement units
Patches from upstream that were not ported to OSS