Raise exception if the colormaps directory does not exits, closes #73
Merge pull request #74 from chrisfilo/enh/missing_colormap_error

Raise exception if the colormaps directory does not exits, closes #73
In case when filestore and colormaps are not defined revert to the ones
provided with the source code. closes #42
Merge pull request #75 from chrisfilo/fix/inplace_import

In case when filestore and colormaps are not defined revert to the ones