Add smooth option to series
Support same subtypes in chart_line as in chart_scatter
Restructed doc layout to avoid duplication of images in build.
Added chart axis font rotation.
Added test for 0 data in Worksheet Tables.
Fixes for PEP8 formatting.
Added tests for smoothed charts.
Additional test for smoothed charts.
Changes for smooth scatter and line plots
PEP8 formatting changes
Added an example for making in memory workbook and serving it via simplehttpserver
Merge pull request #24 from alecxe/master

In memory workbook example (SO)
Add comment
Remove subtype stuff for line charts
Add note about smooth option in add_series docs
Merge pull request #22 from dieterv77/SmoothLineCharts

Subtypes for line charts