Openpyxl

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Minor changes
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* The '=' string is no longer interpreted as a formula
* When a client writes empty xml tags for cells (e.g. <c r='A1'></c>), reader will not crash

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Bugfixes
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* `260 <https://bitbucket.org/openpyxl/openpyxl/issue/260>`_ better handling of undimensioned worksheets
* `268 <https://bitbucket.org/openpyxl/openpyxl/issue/268>`_ non-ascii in formualae
* `282 <https://bitbucket.org/openpyxl/openpyxl/issue/282>`_ correct implementation of register_namepsace for Python 2.6

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Major changes
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Always parse using cElementTree

Minor changes
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Slight improvements in memory use when parsing

* `256 <https://bitbucket.org/openpyxl/openpyxl/issue/256>`_ - error when trying to read comments with optimised reader
* `260 <https://bitbucket.org/openpyxl/openpyxl/issue/260>`_ - unsized worksheets
* `264 <https://bitbucket.org/openpyxl/openpyxl/issue/264>`_ - only numeric cells can be dates

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* `247 <https://bitbucket.org/openpyxl/openpyxl/issue/247>`_ - iterable worksheets open too many files
* `252 <https://bitbucket.org/openpyxl/openpyxl/issue/252>`_ - improved handling of lxml
* `253 <https://bitbucket.org/openpyxl/openpyxl/issue/253>`_ - better handling of unique sheetnames

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* `246 <https://bitbucket.org/openpyxl/openpyxl/issue/246>`_

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Compatibility
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Support for Python 2.5 dropped.

Major changes
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* Support conditional formatting
* Support lxml as backend
* Support reading and writing comments
* pytest as testrunner now required
* Improvements in charts: new types, more reliable


Minor changes
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* load_workbook now accepts data_only to allow extracting values only from
formulae. Default is false.
* Images can now be anchored to cells
* Docs updated
* Provisional benchmarking
* Added convenience methods for accessing worksheets and cells by key