ADD JS/VIDEOSEARCH.JS

To abstract YouTube's API away from the ytsearch plugin, a more general
class will be written. This is just the boilerplate for that class
VIDEOSEARCH.JS: INITIALIZE SETTINGS PROPERTY

Set up the settings property. Main differences from ytsearch.js are:

- A base url must be specified so that the service is abstracted from
  YouTube
- For displayResult, a different object structure for the result is
  assumed (a simpler one). Will be noted in the documentation, but will
  probably just be title, description, id and meta to hold the rest