Bug fix to create_blank_raster (Alex Zvoleff), modded build_raster_header to (hopefully) not throw an error when not calculating minmax, and updated the version number.

git-svn-id: svn://r-forge.r-project.org/svnroot/spatial-tools/pkg@105 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Some alpha tools uploaded.

git-svn-id: svn://r-forge.r-project.org/svnroot/spatial-tools/pkg@106 edb9625f-4e0d-4859-8d74-9fd3b1da38cb