add scratch
don't initialize history (it seems not to be necessary, though I'm not confident
implement useful procedures
add tests
cosmetic changes
Merge branch 'master' into editline
comment out `read-history` test
implement history manipurating procedures
add test and description comment
add history-expand and its test cases
separate example from test
remove redundant code
find exactly required header file
Find readline.h in both editline/ and edit/readline/
include picrin's headers before editlines' so as they can refer <stdio>
wrap variable expantion with ${}
Merge pull request #190 from KeenS/editline

Readline binding