Make sure ticks are off even if meridians and parallels not labelled.
Added polyconic example.
Updated for addition of polyconic.
Added polyconic projection.
Added gnomonic and cassini-soldner examples
Added gnomonic projection example (great circles are straight lines)
rsphere no longer an instance variable (use projtran.rmajor instead)
Updated for 0.4.2
Added gnomonic and cassini-solder (now an even dozen projections supported)
fixed a bug in call to font.get_kerning()
