feat(client): add auth:whoami

This adds a new command to the client which will display the current
user who is logged into the deis controller.
fix(controller): inject config on top of existing environment
fix(controller): do not commit to latest

while this was a nice-to-have before, we are actually pushing config
values on top of the latest build, which breaks config:unset.
fix(controller): use build tag if present
Merge pull request #2127 from bacongobbler/2100_env_in_dockerfile

fix(controller): inject config on top of existing environment
feat(builder): inject GIT_SHA into builder apps
fix(builder): use proper dockerfile syntax
chore(*): bump CoreOS to 471.1.0
test(integration): add auth:whoami test
style(publisher): use standard PS1
Merge pull request #2089 from bacongobbler/git_sha

feat(builder): inject GIT_SHA into builder apps
chore(controller): remove unused django-allauth app
fix(auth): use djangorestframework login/logout views
chore(release): update version to v0.13.1
Merge pull request #2152 from mboersma/bump-0.13.1

chore(release): update version to v0.13.1
Merge pull request #2150 from mboersma/coreos-471

chore(*): bump CoreOS to 471.1.0
Merge pull request #2140 from bacongobbler/whoami

feat(client): add auth:whoami
Merge pull request #2024 from mboersma/remove-allauth

chore(controller): remove unused django-allauth app
Merge pull request #2151 from bacongobbler/standard-prompts

style(publisher): use standard PS1