Python-docx

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- Add feature 15: section page size
- Add feature 66: add section
- Add page margins and page orientation properties on Section
- Major refactoring of oxml layer

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- Add feature 19: Run.underline property

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- Add feature 17: character style

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- Fix issue 23, `Document.add_picture()` raises ValueError when document
contains VML drawing.

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- Add 20 tri-state properties on Run, including all-caps, double-strike,
hidden, shadow, small-caps, and 15 others.

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- Advance from alpha to beta status.
- Add pure-python image header parsing; drop Pillow dependency