#266 Prepare Git repo for v0.5 development

Merged Dennis Hendriks requested to merge 266-prepare-git-repo-for-v0-5-development into develop

Also updated the release update documentation for version upgrades. Less manual work is now needed. Probably due to upgrade to Tycho 2.5.0 as part of #158 (closed).

Closes #266 (closed)

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