Update project structure, dependencies, and documentation

- Remove culturegraph dependency from lodmill-ld
- Update Hadoop jobs to use Hadoop API directly
- Support multiple job input paths passed via CLI
- Update scripts and add basic workflow documentation
- Set up lodmill-rd project with culturegraph dependency
- Move initial culturegraph API experiments to lodmill-rd
- Update README and build config files (poms, travis)
Move hbz MARC ingest experiment into lodmill-rd and enable PMD
Merge pull request #12 from fsteeg/structure

Update project structure, dependencies, and documentation