Added example cases:
- 2 columns layout
- offset pagination
- 1 layout per page
- master pages

Put the 2columns example in an "examples" folder so that the boilerplate
stays as basic as possible.
Nota: you can use the class "recipient" to create a new box to flow
into.

New files: `debug.less` + `ui.less`

`typography.less` is now called `styles.less` and is located into the `setup`
folder.

NEW: a `start` file, which you can double-click to launch the
mini-server instead of going into a terminal.

examples of polyfill usage: It works on Chromium and Firefox ! But the polyfill seems to also apply on webkit, although there is no need for it.

example with Villa Arson diplômés 2015, replacing class name "page" into
"loaded page" so that it doesn't get the styles from the boilerplate.

Content.html in examples folder then uses a longer text.