tested with gdata ass old as 2.0.14
for my convenience, grab auth from environment

remove os.environ debug print
get .next() working

I'm pretty sure this is the wrong way to do this, but oh well.
fix got error codes the wrong way from the exception
add placeholder for http403 error
have the each row save a reference to the original sheet
remove need to store client in a global
add ability to re-use the spreadsheet client across multiple sheets
add ability to get the sheet's browsable url
update: figure out the current worksheet if it was never given
add nose and testrunner
add some basic tests