Humanise parser.

Removed reinvented csv parser.
Broken backward compatibility.
Simplified csv row parsing routine.
Add Python 3 support
Simplify parser
Separate repr and str methods
Fix demo.py
Fix doc
Cosmetics
Remove unneeded utf 8 encoding
Use unicode_literals everywhere
Complete unicode move
Typo
Update demo.py
Revert cosmetics
Update README.md
Merge pull request #1 from ZipFile/master

Python 3 support and general cleanup