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Merge remote branch 'origin/master'
check parameters for minetest.log lua function
Merge pull request #447 from sapier/add_lua_log_parameter_check

BUGFIX: check parameters for minetest.log lua function
Workaround failing Travis clang build.
Place block when holding sneak while right-clicking nodes with formspec
Dont call on_rightclick() if sneak is pressed
Add Spanish, Russian, Polish and Romanian languages.
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Merge pull request #441 from kwolekr/mapgen_factories

Make mapgen factory setup more elegant, add mapgen_v6.h
Merge pull request #442 from kwolekr/mingw_compile_fix

Fix compile under MingW
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Translate key functions in key change menu
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