Pollyreports

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- Removed Unicode encoding from Element class (as inserted by Jose Jachuf in
v1.6.7) which caused issues for Python 3. Added Element.text_conversion
variable to contain a reference to the function for converting self.text
for output; this variable can be used to restore Jose's behavior with a
single line of code, as described in the comments for the Element class.
[Chris Gonnerman]

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- Added titleband and reportheader to Report object; Added Image and
ImageRenderer classes; Updated reference documentation to include all
these features. [Chris Gonnerman]

- Changed SumElement.summarize to treat None as integer 0. [Chris
Gonnerman]

- Fixed missing comma in setup.py. [Chris Gonnerman]

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- Many minor documentation updates. [Chris Gonnerman]

- Updated docs, added changelog generation using gitchangelog. [Chris
Gonnerman]

- Removed .gitignore from .gitignore. [Chris Gonnerman]

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- Changed heuristic for group header orphan avoidance; now uses average
detail height averaged with maximum detail height. [Chris Gonnerman]

-----------------

- Group headers now use average detail band length to avoid at least
some "orphan" header band situations. [Chris Gonnerman]

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- Corrected sample programs to use "align =" instead of "right =" [Chris
Gonnerman]

- Updated project status in setup.py. [Chris Gonnerman]