Fix oer-data build and tweak project setup

- switch dependencies to actually released versions
- disable code that does not work with these dependencies
- configure Java 1.7 in pom.xml and Eclipse project settings
- enable format and import save actions, format code
- remove unused code from pom.xml and update versions
- create versioned log/ directory required by logger
- use Guava instead of Commons IO
- set up .gitignore file