Chapter 1 section 1.2.2.

* Create SPA base HTML.
Chapter 1 section 1.2.4.

* Add spa-slider.
Chapter 1 section 1.2.5 step 1.

* comment on SPA slider javascript.
Chapter 1 section 1.2.5 step 2.

* [spa-slider:javascript] add function templates.
Chapter 1 section 1.2.5 step 3.

* [spa-slider:javascript] implement basic spa slider.