append contributor names
fix #26
small optimize
use 'pc' as little as possible
save instruction pointer to pic_state
restore ip when returned from c function
rename pic_callinfo.pc -> ip
[bugfix] close only closed variables...
apply' argument treatment was broken
add tail-call test
'apply' calls given procedure by trampoline
add OP_NOP
use OP_NOP in pic_proc_apply
add OP_NOP
add RETURN node
don't emit duplicate OP_RET in codegen_lambda
duplicate OP_RET
toplevel expression can be considered tail expresssion
show argument values when entering OP_CALL
booting message completely useless, shrink.