Fix navigation menu. Fixes #23.

Fixes #23.

Added titles to page frontmatter. Added ability to sort pages in navigation by weight.

Added base template to minify HTML, mainly to get rid residual whitespace generated by liquid.

Changed styling for navigation.

How it looks on iPhone: https://saucelabs.com/tests/9ec35c098bfd4f49ab40c5364988be17

How it looks on IE in Windows: https://saucelabs.com/tests/1e08bd3186d34e32bfaf75767c5f852c

@aplannersguide please review.