[IPython Notebook] Add "In" and "Out" before code 

Fix problem when PR #252 was merged.

## Short

The template used in #252 was `swc.tpl` and after merge was `_template/ipynb.tpl`. I just replace `_template/ipynb.tpl` with `swc.tpl`.

## Long

The IPython Notebook look like:

![bug](https://f.cloud.github.com/assets/1506457/2159339/1f50dfe8-94a3-11e3-9631-1fa6c0f99d95.png)

For novice will be a little hard say which code sample was input and output. For help than we add "In" and "Out" just before the code samples.

![fix](https://f.cloud.github.com/assets/1506457/2159340/2345b948-94a3-11e3-9e6d-4591c2ed483e.png)