Combine CSS files at build time and remove trailing whitespace.
Add README.md and .gitignore.

Also move TODO in README.md.
Fix validation errors and trim trailing spaces.
Move inline style to custom.css.

Conflicts:
	_includes/custom.css
Switch to Bootstrap.

* use Pygments for code highlighting so no need for prettify
* Bootstrap build with only the needed components see bootstrap-info.md

Conflicts:
	_includes/prettify.css
	_includes/print.css
	_includes/screen.css
	all.css
	prettify.js