login() error reporting broken

[TheKat]

In the NSNitro.login() function is this:
raise NSNitroError("Error logging in!" + ue.message)

However ue.message contains nothing. It's empty. This gives fairly useless error messages. ie:
NSNitroError(Error logging in!)

This should be more similar to this:
raise NSNitroError("Error logging in! " + str(ue))
which causes the error to come back more usefully similar to:
NSNitroError(Error logging in! <urlopen error [Errno 111] Connection refused>)

[favoretti]

Thanks, pushed a fix.