Better way to add optional extension to specified template file#491

Merged

takluyver merged 8 commits intojupyter:masterfrom takluyver:i490

Jan 6, 2017

+79-14

Commits on Dec 22, 2016

Commits on Jan 3, 2017

Add assertion that template does not exist with specific extension, so error output will be useful. Change file name
mpacer
committed