Allow setting tag message with $EDITOR.#1

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ryneeverett wants to merge 2 commits intoekohl:annotated-tagsfrom

ryneeverett:annotated-tags-editor

Commits on Feb 28, 2016

Allow setting tag message with $EDITOR.
ryneeverett
committed

Commits on Feb 29, 2016

Address @ekohl's comments.
ryneeverett
committed