Polymer experiment initialization.
This experiment aims to build a slide show with the polymer library.

This commit contains:
- First implementation of the slide show core
- Controls with mouse and keyboard
  - Display next element
  - Go back to the previous element
  - Navbar at the bottom of the page
  - Slide selection grid
- Theme init for slides
- Polymer element definition extension for animated lists

Files hierarchy:
- polymerExperiment/README.md : ReadMe file with information about the experiment
- polymerExperiment/css/layout.css : style for the slide show
- polymerExperiment/index.html
- polymerExperiment/js/jquery-1.11.0.min.js
- polymerExperiment/js/main.js : contain the controls and the logic of the slide show.
- polymerExperiment/myelements/animated-list/animated-list.html : element definition for animated lists
- polymerExperiment/polymer/ : folder with polymer framework - do not alter files
ThreeJs experiment

Moving README.md file from the root of the repository to this folder (to avoid too big README file when several experiments will be built)
Adding comments on the 3 main files: index.html, main.js and layout.css
Clean layout.css from unnecessary declarations
Change main README.md file to only contain experiment quick summary and link to the demo