version 0.11-1
- updated examples of tmPlot

version 0.11
- added treemap type "value", which means that values of the color variable are directly mapped to the color palette. This type is mostly used for the Map of the Market kind of treemaps, with negative values colored red, zeros yellow, and positive values green.
- added the possibility to use own palettes
- added parameters to tweak the font sizes
- cleaned up the code

version 1.0-3
- faster aggregation (using data.table instead of plyr)
- treemap types rearranged: also added type "index"
- second layout algorithm implemented: squarified treemaps
- more possibilities added to tweak font sizes
- argument na.rm added in case there are missing values during aggregation

version 1.0-4
- two bugs fixed (category labels were not shown, and sorting order was sometimes neglected)
- aspect ratio control added (argument aspRatio)