ggpie 0.2.5

Changed label info style to support legend (ggnestedpie and ggrosepie don't support this). (Fix #4)
Fixed bugs in ggpie3D.

ggpie 0.2.4

Added label_len to adjust the length of labels (Fix #2).
Corrected some spelling mistakes
Added nudge_x and nudge_y in ggpie, ggdonut, ggnestedpie to adjust the space between the label and the plot (Fix #3).

ggpie 0.2.0

Added ggrosepie to create rose pie and donut plot, it can also support single or two variables.

ggpie 0.1.0

Added ggpie to create 2D pie plot with single group variable.
Added ggdonut to create 2D donut plot with single group variable.
Added ggnestedpie to create 2D nested pie plot with two group variables.
Added ggpie3D to create 3D pie plot with single group variable.