Remove math mapgen
Remove indev mapgen
Remove proller from credits
Merge commit '2d90aca'

Conflicts:
	freeminer.conf.example
	src/defaultsettings.cpp
	src/emerge.cpp
	src/mapgen_indev.cpp
	src/mapgen_indev.h
	src/mapgen_math.cpp
	src/mapgen_math.h
Merge remote-tracking branch 'minetest/master'
remove mail