Add support for late 2019 release

Update elasticsearch container version

Remove yarn build artifacts

Add plaso-tools google/timesketch#448

Lower compose version to 2.0

Enable graph backend if Neo4j env vars are specified

Test frontend on build

Start worker a little later #3

Land pull request #7 from ilyaglow/data-persistence

Add volumes to persist db data

Landing pull request #5 from ilyaglow/install-yarn

Add yarn to build static content

Remove user creation messages

Remove trailing space

Add readme with basic usage