address `mojito create foo myfoo` use-case issue #3

change "." to "./archetypes" in SRCDIRS since former behavior
is actually identical to existing getSourceDir(), and saves no
typing. punting on test for now since code unwisely relies on
the process.cwd(). fixme.
env instead of args, opts, meta
rm non-working email, +ss
add --dir to usage text
update tests for env vs. args, opts, meta
lint validthis:true
opts.debug is parsed as opts.loglevel now
tag v0.0.2 (based on v0.0.1-7-g47bec1d)