Update xlrd/compdoc.py

fixed AttributeError: 'DirNode' object has no attribute 'totsize'
Fix for issue #22 where output is not guarded by verbosity check
Merge pull request #19 from suvit/patch-1

Update xlrd/compdoc.py
Merge pull request #23 from rossjones/issue-22

Fix for issue #22 where output is not guarded by verbosity check
ignore build dir
add missing shebang line to keep distutils in linux happy, fixes GitHub #17