Version bump

Bumpity bump

Merge pull request wp-cli#1208 from boonebgorges/master

Use foreach loop rather than array_map() to invoke do_hook() callbacks
Conflicts:
	.travis.yml

bump version to 0.15.0 and update .mailmap

set version to 0.14.1

bump version to 0.14.0

bump version to 0.13.0

set version to 0.12.1

bump version to 0.12.0

0.11.2 final