Merge pull request #3 from mukil/contributions

Contributions
fix minor error
remove unused migrations
import schema test
remove unused test edits
fixes for 4.4-SNAPSHOT
ignore jackson/import development for now
gitignore
wrap deletion of topic types in transaction
add jackson (for now) and some create schema
try to parse data..
remove old code
Merging with @freifunk/query.api.freifunk.net/master

Upstream changes:
- removed unused dm4-folder
- integrated jackson
- added some schema parser testfile

Changes:
- Fixed sloppy formatting
- commented ImportSchema run

Envisioned code style regarding indention:
- Tab size: 4
- Line width: 120