Use fixed versions of dependencies
Update parent POM version
Minor fixes in POM files

- make `org.daisy:daisy:3` the parent of all POMs
- add SCM info
- filter `application.conf` so that the version is taken from the POM
[maven-release-plugin] prepare release v1.8
[maven-release-plugin] prepare for next development iteration
Merge pull request #14 from daisy/release/v1.8

Release v1.8