Unify OSSAP stats embed JS #8

#8

#### Changes

* New single JS file `"ossap/stats.js"` provides all avaliable stats and embed code snippets
* No more individual stat-specific embed codes
* No more separate code snippet menu item.

#### When there are no stats, this message appears:

![screen shot 2014-01-08 at 4 19 44 pm](https://f.cloud.github.com/assets/228733/1872929/94da4fe4-78ae-11e3-95e3-99ced2bed1e5.png)

#### Normal output:

![screen shot 2014-01-08 at 4 20 04 pm](https://f.cloud.github.com/assets/228733/1872928/8eccc5dc-78ae-11e3-9b63-dc910a5e1da2.png)