Wikify for semantic wikilinks. Links like `sherry Turkle` become `Sherry_Turkle`

Links like /pages/sherry_Turkle will not get wikified.
Links like http://example.com/sherry_turkle.ogv will not get wikified
Merge the solutions of A and E

To differentiate between wikilinks and absolute links,
a more robust mechanism still needs to be found.
Possibility of having a hash in the wikilink (not escaped)
Basic proposal for timecode extensions in test/features/timecode/

(Run all tests with npm test --force)
(generate js with grunt build:web)
Merge pull request #2 from codingisacopingstrategy/aa

Wikify for semantic wikilinks. Links like `sherry Turkle` become `Sherry_Turkle`