Create dump-contacts2db-telonly.sh

I've duplicated stachre's script, with the addition that it cleans all contacts which do not possess a telephone number. If you use a Google Account as the vast majority of people do, the .vcf which the original script creates contains ALL contact data, including ones entered personally by the owner and ones Google automatically added which one may not want in their own device. For me, the difference is that all contacts I have put in my phone all have phone numbers whereas none (or few, which I want to keep anyway) of the automatically-added ones do, therefore the change.