"_lua" in path breaks param2

[zgushonka]

Got unpredictable behaviour if output path contains _lua string.
e.g. \tmp\lua_mini_test\booster.lua

Possible solution:
in CommandLineMinify.lua and / or similar places:

line 66-67:
	--keep the user from accidentally overwriting their non-minified file with 
	if arg[1]:find("_min") then

->	
        --keep the user from accidentally overwriting their non-minified file with 
	if arg[1]:find("_min.lua") then