Display current branch name rather than "master"

Use exe/ as bin directory

Install gem as default rake task

git-bump 1.1.0

Friendlier error if tag fails

Don't blow away botched commit

Use lower level API to reset

Drop release commit if tagging fails

Better error when no previous release

Copy commit body into tag

Use tag -a if previous tag unsigned

Clearer grammar

Fix reference to the sims

git-bump 1.0.0