Release v2.0.0 -> v2.1.0 · deis/controller

a1c4619 config: validate PORT and HEALTHCHECK_* values for config:set operations
ccc6b1f release: require PORT to be set when private registry is set
0231c58 django: explicitically define on_delete for ForeignKey fields for 2.0 compat
6e136e2 debug: DEIS_DEBUG now affects Django DEBUG as well
4c674d0 release: throw 409 when identical release is done sequantially
af76733 api: Add healthcheck field to Config
7af2197 settings: log all SQL queries if DEBUG==True

df30ee6 api: remove slug tarball info from app log
61b6858 scheduler: remove unused health check config option: HEALTCHECK_PORT
c6686e9 scheduler: cast ports to int before passing them on to k8s
2f1b140 management: handle errors in object loading and application deployments instead of throwing exceptions
dc4769a logs: retry fetching logs from the logger 3 times if the services is unavailable
c8c7d80 scale: get the desired number of replicas from the rc
3fa6f70 scheduler: make deploy have 0 replicas by default and then use scaling to go up
09b9be2 secrets: update env secrets if they already exists (overwrites existing values)
5fb1bbb config: when rolling a new config copy from the latest release instead of latest config for the app
0d9988b serializer: skip None values in config and registry
936a40e exceptions: tests now capture critical only and uncaught exceptions have been reclassified as critical
3f980b8 exceptions: log certain APIExceptions tracebacks
9f8ac04 config: return a 422 if unsetting a config key that does not exist
cae4bf9 models: hypens -> hyphens (#840)

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