How to export Contacts version 9.0 data or .abbu file to .csv or other usable spreadsheet format
Really simple: 


In Contacts select all contacts you want to export or press CMD-A.
Press CMD-C (copy to clipboard).
Open a new, empty Numbers document.
Delete any existing table in that document.
Press CMD-V to paste your clipboard.


This gives you a nice spreadsheet with all your selected contacts and proper rows and columns.