Make console output less verbose

[Richard-Degenne]

When using Spreadsheet in a console (when debugging for instance), the output produced by a simple Spreadsheet.open is humongous. And there are lots of other calls that produce way too much output.

I know I can do Spreadsheet.open(file); nil to shut it off, but it's not clean, imo.

[zdavatz]

;) - let me know if you come up with a patch that works and that makes all the tests pass. I personally never use IRB.