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.
Output some XML for debugging