Pycel

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Added
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* Implement Array (CSE) Formulas

Fixed
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* Fix 45 - Unbounded Range Addresses (ie: A:B or 1:2) broken

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Fixed
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* Fix 42 - 'ReadOnlyWorksheet' object has no attribute 'iter_cols'
* Fix 43 - Fix error with leading/trailing whitespace

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Added
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* Implement XOR(), NOT(), TRUE(), FALSE()
* Improve error handling for AND(), OR()
* Implement POWER() function

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Changed
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* Move to openpyxl 2.6+

Removed
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* Remove support for Python 3.4

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Changed
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* Work around openpyxl returning datetimes
* Pin to openpyxl 2.5.12 to avoid bug in 2.5.14 (fixed in PR 315)

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Changed
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* Much work to better match Excel error processing
* Extend validate_calcs() to allow testing entire workbook
* Improvements to match(), including wildcard support
* Finished implementing match(), lookup(), vlookup() and hlookup()
* Implement COLUMN() and ROW()
* Implement % operator
* Implement len()
* Implement binary base number Excel functions (hex2dec, etc.)

Fixed
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* Fix PI()