s/HELPER_ROOT/HELPERS_ROOT/g
fix error message for bad parameters
move prove helper into separate file
include versions of Dist::Zilla author deps
refactor testing

Split testing into general testing files directly in t/, and dist
specific testing into separate directory with a script to check it.
use small bash tap implementation
Module::Build testing
move --auto handling into its own file
more outputs from auto command
refactor ./Build override
add --debug flag and provide some debug messages
only override needed bits (EUMM vs MB)
more diagnostics on dist building
test verbose