Add a library for embedding Oppia explorations in other web pages [author]

Please note that the library file is oppia-player-0.0.1.min.js in this directory:

    https://code.google.com/p/oppia/source/browse/?name=develop#git%2Fstatic%2Fscripts

Evidence of popularity: This project has been starred by 119 users (see attached screenshot).

![stars](https://cloud.githubusercontent.com/assets/1892880/2868001/13923902-d23f-11e3-9cee-dc4d8a56d6b6.png)

Thanks!