POM: fix dependency to bij SNAPSHOT version

Without this change, the build fails because the previously pinned
20061205 version was never deployed to the ImageJ Maven repository.
POM: make organization Fiji, not ImageJDev

The Cookbook is a Fiji project!
POM: link to the exact right Jenkins job
POM: remove unneeded .git suffixes
POM: simplify repositories block
POM: use latest version of pom-scijava parent