Fixed an nvram quoting issue to enable python -c

Previously, `zvsh --zvm-image=... python -c "<code>" did not work. This
fix adds some better quotation handling to enable this functionality.
This affects the generation of the nvram file.
Merge pull request #2 from larsbutler/fix-python-minus-c

Fixed an nvram quoting issue to enable python -c
fixed whitespace handling in command line arguments
Added partial terminal window sizing support (no resizing handling)
Merge branch 'terminal'
Merge pull request #3 from rampage644/master

Terminal window sizing