Format bazel BUILD files with a standard convention

Current version

buildifier requires the following formula to be installed:
go 1.10.1 Open source programming language to build simple/reliable/efficient software

Recent formula history

ilovezfs buildifier 0.11.1
ilovezfs buildifier 0.6.0
ilovezfs buildifier: build with go instead of bazel
ilovezfs buildifier 0.4.5
Jeremy Hale buildifier 0.4.3 (new formula)

Formula code at GitHub