Merge pull request #1 from lukecampbell/master

Adds netcdftime and patches setup.py
Adds meanings to error codes (per udunits2.h)
Updates README; removes iutil
Adds __init__ imports; updates README
Update README.md
Updates setup.py; adds LICENSE
Updates README / setup.py; bumps version
Adds DESC; updates setup.py
Adds files to MANIFEST; bumps version
Updates setup.py with better include/lib path management