app: support flags/aliases given as (--long, -short) tuple#319

Merged

minrk merged 6 commits intoipython:masterfrom ankostis:short_long_flags

Sep 26, 2016

+165-65

Commits on Sep 22, 2016

app, ipython#319 : re-raise alias/flag help-msg errors
ankostis
committed

Commits on Sep 25, 2016

app, ipython#319 : fix triple-dash in alias help-msg
ankostis
committed