Merge tag 'rel-0.7.0' into develop

Tagged rel-0.7.0
Download config only if not present
Dont use sed inline on mounted file
Move download inside conditional
Fixed release phony target.
Added 9200 & 9300 to Dockerfile for inner-container communication.
Typo fix.
Added 9200 & 9399 to Vagrantfile for testing across boxes.
Merge pull request #19 from pblittle/feature/readme-tweaks

Feature/readme tweaks
Merge pull request #18 from hamiltont/develop

Download default config only if no config present (continued from #16)
Download config only if not present
Dont use sed inline on mounted file
Move download inside conditional
Merge remote-tracking branch 'origin/feature/conditional-config-download' into feature/conditional-config-download
Merge pull request #20 from pblittle/feature/conditional-config-download

Feature/conditional config download
Added 'DEBIAN_FRONTEND=noninteractive' to Dockerfile.
Minor comment tweaks.
Brought back `ES_PORT` publish flag to `make build`.
Minor Makefile updates.
Fixed exec indentation.