plotluck-1.0.0

• Compatibility with ggplot 2.1.0
• Changed plotluck() arguments to use a formula instead of arguments x,y,z
• Removed plotluck.multi() from being public - functionality can now be accessed using dot symbol '.' in plotluck formula
• Added function sample.plotluck() to generate random plots from a data set
• Changed heat map visualization to vary rectangle size with count/weight
• Renamed and removed some options
• Added new option verbose that outputs information about plot types, log scaling, etc
• Added new override option geom to directly set plot type
• Eliminate exclude.factor arguments; instead, use na.rm to remove missing values at the start if requested, else keep throughout
• Estimate size of legend to decide wheter vertical or horizontal placement takes less space
• Estimate axis label overlap to write at an angle
• Select palette or colorbar based on variable type; use brewer palettes
• Use entropy order for lattice (2-variable) layout as well
• Improve factor ordering algorithm
• Several bug fixes