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Add `help` and `showconfig` targets to Makefile
add "all" to test dependency
make test restructuring
mrit - Embeddable Ruby ISO Test
merge mirb target to all in toplevel Makefile
mirb - Embeddable Interactive Ruby Shell
run make -c mrblib from top
Makefile: run make at src first
remove ios compile tasks
build process restructured
Fixed to forget to remove some files on 'make clean'
fix Makefile: quoted CC/LL are heap up to each Makefiles.
add mruby sources