added stat_ellipse
committing just the stat_ellipse changes
Not necessary to declare ggplot2:::Stat
added a euclidian distance option
Fix fortify-spatial namespace issue (#879)

Fixes fortify error when sp namespace is not loaded.
https://github.com/hadley/ggplot2/issues/879
Add mgcv to suggests
Only run staticdocs if deploying
Themes vignette from Dennis Murphy
Update themes vignette style
Allow setting one of the limits of scale

Implements setting of only one limit of a continuous scale by specifying
NA for the limit which you don't want to set.
Style fixes suggested by winston
Update news and update documentation
Reformat news
Fix documentation for ylim

The range of mtcars wt data is from 1.513 to 5.424, so the previous example was
causing an error because there were no points to obtain a range from.
Merge pull request #908 from jimhester/one_limit

Allow NA in limits
NEWS tweaks
Working on development doc
Better name for rstudio project file
Added defaults to the reparameterise function of dotplot so that it still works when no params are passed in (as when using qplot).
Merge pull request #912 from rasmusab/dotplot-qplot-fix

Fix for issue #825 so that dotplot now works with qplot.