Merge branch 'develop'
Update docs
Update readme
Better default origins in stat_bin2d
Fixes #243
Remove missing values in position_stack.
Fixes #242
Message if grouping clearly incorrect in geom_path.
Fixes #240
Legend removes all NA breaks.
Also some code cleanup
Document theme_get and theme_set usage.
Fixes #185
Doc tweaks
bug fix: remove legend if there is nothing to be shown (#100).
fix: now legend of point is not automatically filled.
fix: now legend does not show out-of-range values (bug after the changes in scales, so this bug does not appear in ver. 0.89)
guide specification in stat_XXX and geom_XXX: moves from legend to guide.
guides (legend): remove default legend specification from geom-hline and geom-vline
quick fix of incorrect automatic range for geom_box (#274)
Added notch option to boxplot.
Code cleanup for notched boxplot.
Close the boxplot polygon so coord_polar and coord_trans work properly.
rename 2D and hex aggregation to summarization consistent with 1D summary.
2d-summary: change the function names and pass ... to fun