Basic docker image setup
Changes in docker image setup:

- database config and webapp base secret retrieved from environment variables
- renamed nginx configuration files
- tidy up dockerfile
Initialize database if it does not exist
 Deploy: configure file monitor daemon
 Deploy: setup ssh key for client synchronization
Correctly export as JSON

See #19
Correctly parse rsync transfer indicators

See #19
Update cases' sick status

Fixes #12
 Deploy: Install rsync on server
 Client: support for custom ssh user, port and private key for sync process
  Moved development client sync key
 Restructure Dockerfile to improve cache performance
Merge branch 'deploy-docker'

Conflicts:
	client/src/main/groovy/org/instedd/act/sync/RsyncSynchronizer.groovy
 Reduce gradle output for travis build