cmdbuild-3.1.1 need to talk talk with a pg db 9.4-10

• ENV POSTGRES_USER postgres
• ENV POSTGRES_PASS postgres
• ENV POSTGRES_PORT 5432
• ENV POSTGRES_HOST cmdbuild_db
• ENV POSTGRES_DB cmdbuild_db31
• ENV CMDBUILD_DUMP demo

_step

• docker run --name cmdbuild_db -p 5432:5432 -d itmicus/cmdbuild:db-3.0
• docker run --name cmdbuild_run --link cmdbuild_db -p 8080:8080 -d cavamagie/cmdbuild-3.1.1