New features

• New coordinate system for small scale maps. coord_quickmap() computes and
  sets the correct aspect ratio between one degree of latitude and one degree
  of longitude at the centre of the plotted region. It does not perform full
  fledged mapping projection as coord_map() does and therefore is much
  faster. Yet, it gives a correct approximation for small scale maps (a few
  degrees in either direction) at medium to low latitudes (@jiho, #922).
• geom_boxplot gain new varwidth argument for controlling whether or not
  the width of boxplots should be proportional to the size of the groups
  (@tsieger, #927).
• position_jitterdodge() combines position_jitter() and position_dodge(),
  allowing the user to plot and align points generated by e.g. geom_point()
  with those generated by a dodged geom_boxplot(). See
  example(position_jitterdodge) for a potential usage. (@kevinushey, #932)
• Allow specifying only one of the limits in a scale and use the automatic
  calculation of the other limit by passing NA to to the limit function,
  xlim() or ylim() (@jimhester, #557).
• Allow to use brewer palettes for continuous scales, through the new
  scale_fill/colour_distiller() functions (@jiho, #925).
• stat_ellipse() adds data ellipses. It supports bivariate normal and t distributions,
  as well as a euclidian distance circle. (@JoFrhwld, #926)
• Add new themes: theme_linedraw() is similar to theme_bw() but with
  truly only white and black elements and spacing between elements identical
  to theme_gray. theme_light is similar but with light gray box and axes
  around the plot, to emphasise content more (@jiho, #923)
• new theme settings panel.margin.x and panel.margin.y (units) allow
  specifying horizontal and vertical gap between panels in facetted plots (for
  both grid and wrap). (Kirill Müller. Fixes #839)
• Fix vertical justification for rotated text. This will change the appearance
  of plots that use textual elements that are rotated by 90° or 270° and have a
  vjust parameter other than the default 0.5; the interpretation of vjust
  and hjust is now the same for both rotated and non-rotated text elements
  (0 = top/left, 1 = bottom/right, 0.5 = centered). (@krlmlr, #883)
• Added helper function labeller() for formatting faceting values.
  (@stefanedwards, #910). Added label_wrap_gen based on
  https://github.com/hadley/ggplot2/wiki/labeller#writing-new-labellers
  (@stefanedwards, #910)

Bug fixes and minor improvements

• aes() no more treats variables like `a..x..b as a calculated aesthetic.
  (@krlmlr, #834.)
• New aes_q() function to generate aesthetic specifications from
  quoted calls/names. aes_string() uses names x and y for first
  two unnamed arguments.
• fortify.SpatialPolygonsDataFrame() now calls polygons without
  requiring the sp to be loaded first (@seancarmody, #879).
• The outliers of geom_boxplot() use the default colour, size and shape from
  geom_point(). Changing the defaults of geom_point() with
  update_geom_defaults() will apply the same changes to the outliers of
  geom_boxplot(). Changing the defaults for the outliers was previously not
  possible. (@ThierryO, #757)
• geom_dotplot() now works with qplot(). (@rasmusab. Fixes #825)
• Marginal improvements to theme_bw() and theme_classic() (@jiho, #934)
• stat_smooth() checks for method = "auto" and method = "glm" in
  a safer way.
• Add "none" to documentation of theme() for parameter legend.position
  (@krlmlr, #829).

Removed functionality

• ggpcp(), ggfluctuation(), ggmissing(), ggstructure(), and
  ggorder() are now defunct and have been removed.