Script to convert LAS to Excel (.xls) (addresses #2)
improvements
Fix Namespace for cmd line args
Merge branch 'master' into excel

Conflicts:
	las_reader/core.py
remove debugging stmnt from las2excel (closes #2)
whitespace
Autodetect & name API function

attempt at autodetecting null values which doesn't
work very well, so disabled by default.

Also added names() function to the API for holeplot
merge
Prepare for ability to create/write LAS files
Fix MD formatting
Merge branch 'unstable'