New in version 0.7.6 (Released January 10th 2016)
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* Replace all non-free resources with free ones:
 - Replace Ubuntu font with Comfortaa
 - Replace Tahoma font with Waree
 - Replace non-free soundjay.com interface sound with free ones by Mike Koenig
 - Obsidian Shell music relicensed to CC-BY-SA 3.0
* Now builds with SFML-2.3, no longer requires GLU
* Binary renamed from (too common) mars to marsshooter
* Added a man-page and appdata
* Misc. small bugfixes
