Add documentation to demo.sh

Add a quick line of documentation to describe each demo program.
Update demo.sh documentation

Wordsmithing...
Add documentation to demo.bat

Add a line for explaining each line of the demo
Add documentation to demo06.py
Add documentaion to demo07.py
demo07.py now imports fixpath

For consistency is my small hobgoblin
typos
Update demo.bat
Merge pull request #28 from merriam/master

Minor documention of demos.