Kanglei Fang

Results 2 issues of Kanglei Fang

Currently test rule will respect test rule's `env` attribute over manual test_env specification, this seems a bit counter-intuitive when setting test environment explicitly like `bazel test --test_env=FOO=BAR` doesn't get what...

cla: yes

Also added customizable date formatter, addresses https://github.com/prolificinteractive/Yoshi/issues/74