Cleaning
Moved all 3D visualization stuff to plot3d.R
Moved ReadShape() function to inst/extras/to-remove.R
Updated HKK website url
Added note and link for 3d plot example in tutorial
Solved rgdal reading for TODO.R
Moved todo and raw code for sp2df into visualization
Updated get_Helsinki_Seutukartta() and get_Helsinki_Piirijako()
Updated package version
Updated package description
Small updates