(WIP) Update tutorial for 0.5.0

We update sample code and descriptions in tutorial pages for 0.5.0

In addition, we fixed followings:

* Add ``lineno`` option to ``code-block`` directive

  * And fix css to does not overflow

* Delete pages that does not exist sample program in jubatus-example repos

  * I added the description, such as the following instead

    ```
    Currently, we have no sample programs except Python (We welcome your contribution!)
    ```

  * [Note] I didn't delete pages of Anomaly

    * Because, Anomaly tutorial is related with some issues
    * Add ``hidden`` option in ``toctree`` directive in tutorial.rst to suppress warning at build

* Add link to jubatus-example repos in program name (e.g. gender, shogun ..)
* Fixed typo

  * Row -> Line
  * famale -> female
  * tatal -> total
  * and more ..


[Note] This patch is a summary of the commit of the `tutorial_0.5.0` branch.