Update BUILDING.txt for latest version.
Merge pull request #99 from Hello71/building

Update BUILDING.txt for latest version.
cleanup and checks to avoid bad addresses

- removed obsolete name reads

#73 bad addresses:
- commented out unused prefix stuff in words
- checks for invalid materials before attempting to read
-
Remove OS-specific entries from .gitignore.

.gitignore should only store items that are generated by the code in the
repository. If your operating systems generates temporary files, put
those in your .gitignore_global.