pfi/pficommon — pull request #34 by takei-yuya (2012-04-04 06:52:49+00:00)
Title: Support convertion between pfi::text::json::json and float type

fixes #31

FIXME: Since precision set to 12, json_float::print may print extra fraction.

e.g.

```cpp
cout << to_json(3.14f) << endl;
```

will be

```
3.1400001049
```

Should json_float have precision property to print float? or make another json_float for float?