Iroin-python-pptx

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- feature 43 - image native size in shapes.add_picture() is now calculated
based on DPI attribute in image file, if present, defaulting to 72 dpi.
- feature 113 - Add Paragraph.space_before, Paragraph.space_after, and
Paragraph.line_spacing

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- add experimental feature TextFrame.fit_text()

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- fix 127 - Shape.text_frame fails on shape having no txBody

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- feature 120 - add Shape.rotation
- feature 97 - add Font.underline
- issue 117 - add BMP image support
- issue 95 - add BaseShape.name setter
- issue 107 - all .text properties should return unicode, not str
- feature 106 - add .text getters to Shape, TextFrame, and Paragraph

- Rename Shape.textframe to Shape.text_frame.
**Shape.textframe property (by that name) is deprecated.**

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- Add support for creating and manipulating bar, column, line, and pie charts
- Major refactoring of XML layer (oxml)
- Rationalized graphical object shape access
**Note backward incompatibilities below**

**BACKWARD INCOMPATIBILITIES:**

A table is no longer treated as a shape. Rather it is a graphical object
contained in a GraphicFrame shape, as are Chart and SmartArt objects.

Example::

table = shapes.add_table(...)

becomes

graphic_frame = shapes.add_table(...)
table = graphic_frame.table

or

table = shapes.add_table(...).table

As the enclosing shape, the id, name, shape type, position, and size are
attributes of the enclosing GraphicFrame object.

The contents of a GraphicFrame shape can be identified using three available
properties on a shape: has_table, has_chart, and has_smart_art. The enclosed
graphical object is obtained using the properties GraphicFrame.table and
GraphicFrame.chart. SmartArt is not yet supported. Accessing one of these
properties on a GraphicFrame not containing the corresponding object raises
an exception.

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- fix: issue 88 -- raises on supported image file having uppercase extension
- fix: issue 89 -- raises on add_slide() where non-contiguous existing ids