Create bleeding edge update site

[gab1one]

Issue

We sometimes need to test unreleased features and super new versions of the upstream libraries and can not wait until they are available in pom-imagej. Therefore we need to create a bleeding edge update site that contains SNAPSHOT versions of SciJava / ImageJ / Imglib2.
This would also allow developers to use locally build versions of those libraries in KNIP with less hassle.

Challenges

• Version strings: bundles build from SNAPSHOT versions must receive an unique (e.g. buildtime) so that eclipse installations always download the newest versions of these plugins. Currently SNAPSHOT is cut from the version string!
• Staying up to date: the jenkins job for this update site should be run regularly, maybe once a day?

[ctrueden]

Currently SNAPSHOT is cut from the version string!

Every snapshot does receive a unique date stamp in the Maven repository. Here is an example. Perhaps this could be reused somehow.

See also the Tycho Maven plugin's How do I embed a configurable build version? FAQ entry.

[gab1one]

We autogenerate pom files, and need to know the SNAPSHOT versions during generation time so they are added correctly. The eclipse aether project looks like a valid but slightly overkill candidate, implementing such a lookup might take a few days.