Add `-g/--group` option to `configure` command to configure all instances in a group.#17

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fschulze wants to merge 4 commits intoployground:mainfrom

fschulze:groups

Commits on Sep 10, 2015

Add ``-g/--group`` option to ``configure`` command to configure all instances in a group.
fschulze
committed
Make test independent of sort order.
fschulze
committed

Commits on Sep 14, 2015