Initial commit
v0.1
v0.11

Modified some points.
v0.12

Wrote specification into RADEME.md
v0.13

Update README.md
v0.14

Moved the following commets to commit log.
- Set the function, which outputs the information of server URL, as callback of httpd.listen()
- Learned the difference between '==' and '==='
- Modified Content-Type to application/json from text/plain
Modified server.js