Ignore comments starting by '/*' or splited on multiple lines

This PR rewrites a little bit the way how comments are ignored in order to exclude all lines without real executable codes.

Before:

![before](https://cloud.githubusercontent.com/assets/737992/3416127/3812a5f8-fe29-11e3-8908-7f9a838b5860.png)

After:

![after](https://cloud.githubusercontent.com/assets/737992/3416134/41068378-fe29-11e3-8161-3cd9486acdc8.png)

Additionally, this PR fixes #233