Merge pull request #4 from NANOsoldierEnke/master

Heartplus fixed
Merge pull request #1 from realtinymonster/master

merge
Add new air_shield texture from moontest
Merge pull request #5 from HeroOfTheWinds/master

air_shield from moontest, now 32x32
Merge https://github.com/realtinymonster/gitpack-minetest