Bump component versions

* imagej-common -> 0.8.3
* imagej-legacy -> 0.8.3
* imaagej-plugins-commands -> 0.2.6

And from pom-scijava 3.4:
* bio-formats -> 5.0.3
* native-lib-loader -> 2.0.2
* scijava-common -> 2.31.0
* scijava-maven-plugin -> 0.2.0
* scripting-jython -> 0.1.3