Not exiting from anywhere other than package main
make everything work with new Bobfile format, get rid of bogus test

Steps:

0. code to convert version 0 to version 1
0. print warning message
0. update tests, finally getting rid of that bogus randomly-failing
tests (per http://golang.org/doc/go1.3#map)

TODO:

0. document new bobfile format, how to convert, and the reasons for the
change