cowplot 0.5.0
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Major changes:
- Fix label positioning in plot_grid() so it is not affected by the scale parameter
- Add draw_label() function which can draw both text and plotmath expressions
- Add parameters hjust and vjust to plot_grid() to allow fine-tuning of label position
- Add annotations underneath plot, via add_sub() function

Other changes:
- Improve vignettes

cowplot 0.4.0
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Major changes:
- Added a function switch_axis_position() which can move/copy the x and/or y axis of a
  plot to the other side
- plot_grid() can now align graphs
- plot_grid() can now make grids with varying column widths and row heights

Other changes:
- Various improvements in the documentation
- Code has been separated into multiple files for easier maintenance

cowplot 0.3.1
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Fix Vignette title

cowplot 0.3.0
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First complete implementation ready for initial release
