Update common submodule.
First draft of Dockerfile for building fdw.
Fixed build.
Merge pull request #29 from starschema/build-fix

Build fix
Now fdw can be built and used without our postgres-fork with docker images.
Fixed hardcoded path.
Reverting previous push of filemode change.
Merge pull request #30 from starschema/docker-build

Docker build
Merge remote-tracking branch 'origin/master' into jenkins

Conflicts:
	Dockerfile