Add Python 3.4 environment.

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Update docs

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1.8 backport to fix to resolve #46.

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Merged in amorris/openpyxl/1.8 (pull request #78)

Backport to resolve bug #46.
Merge duplicate branch

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Always use integers to refer to relationships for reliable sorting.

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Reintroduce more finegrained control for type inferference of strings.

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Resolves #260 for worksheets that are totally undimensioned.

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Merge fix for #260

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Fix for #260 wasn’t merged.

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Improve time regex and add dedicated test.
Still needs work to be able to handle microseconds

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Extend regex to handle microseconds.

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Parametrise test.

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Add setter for cell.data_type

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Parametrise test.

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Use property.

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User property

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Use XML comparison

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Remove stuff commented out that is no longer used.

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Separate wtiter tests, add test for empty worksheet, use xml comparison and remove addtional tests for implicitly empty worksheets.

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