Add new "got fetch" command

This command runs "git fetch" for every specified repo.
Mock some more methods for testing
Add basic fetch tests
Update Changes; add Rolando to contributors
Update dist.ini.

Also rename README and add Makefile.PL.
v1.11

  * Add 'fetch' subcommand (Rolando Pereira)
fix ERR mock
auto-committed by dist.ini
v1.12