add alias of `modulo`, `remainder`, `quotient`
`quotient` is defined in base
import chibi scheme's test
use "%zu"s for size_t
Merge pull request #144 from KeenS/import-test

import chibi scheme's test
add copyright notice
remove file-variable
remove useless notice
add 'make test' target
update travis config
'make test' runs r7rs tests
we don't have support for #x123 literals
fix #140
trampoline_iseq is no longer mutable
shrink trampoline iseq
Merge branch 'issue-140'. close #140
implements (srfi 60)
initial read implementation
store rlabels in global state
api changes of reader/parser