Fixed test cleanup..
Added additional scatter chart test.
Fix for issue where comments and buttons are used together. #64
Initial fix for shape/chart corruption bug. #52.
Tests for issue #52.
Minor doc fix. Closes #50.
Added secondary chart axis example to the docs. Closes #56.
Prep for release 0.68.
Fix for leading = in condtional_formatting range.
Added chart axis font rotation.
Fix for 0 data in Worksheet Tables. Closes #65.
Prep for release 0.69.
Added tests for smoothed charts.
Additional test for smoothed charts.
Fix for inaccurate column width calculation.
Docs for chart line smoothing option.
Fix for images that are the same size as cell boundaries. #68
Fix for images that are the same size as cell boundaries.
Prep for release 0.70.
Fix for image offset issue.