Adjust the pom.xml after the split-off from imglib.git

To make a stand-alone project, we need the developers, contributors,
issueManagement, mailingLists and scm sections, and the parent should
be pom-scijava, too...

This commit's parent corresponds to 34f2267a(Update to pom-scijava
1.130) in

	https://github.com/imglib/imglib

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add a .mailmap

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add a .gitignore file

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>