Python-pptx

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- Add support for opening and saving a presentation from/to a file-like
object.
- Refactor XML handling to use lxml objectify

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- Add support for Python 2.6
- Add images from a stream (e.g. StringIO) in addition to a path, allowing
images retrieved from a database or network resource to be inserted without
saving first.
- Expand text methods to accept unicode and UTF-8 encoded 8-bit strings.
- Fix potential install bug triggered by importing ``__version__`` from
package ``__init__.py`` file.

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First non-alpha release with basic capabilities:

- open presentation/template or use built-in default template
- add slide
- set placeholder text (e.g. bullet slides)
- add picture
- add text box