ggsn 0.3.0
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* Functions from grid package are selectively imported.

* Examples changed to avoid the use of the rgdal package (currently, some user might get "WARNING: no proj_defs.dat in PROJ.4 shared files", using this package).


ggsn 0.2.0
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* 'ggplot2' includaded as a loaded dependency (previoulsy just imported).

* 'plot' and 'rasterImage' functions imported from graphics.

* function 'symbols' renamed as 'northSymbols' to avoid masking.

* function 'theme_bln' renamed as 'blank'.


ggsn 0.1.1
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* First development version.