Add a noSourceCSS option.

This prevents BioDalliance from injecting <link> tags onto the page,
which is helpful if you want to avoid precedence wars and !important by
to managing CSS yourself.
Merge pull request #102 from danvk/feature

Add a noSourceCSS option.
Salt URLs before fetching sequence.
Merge branch '0.12.x'
Merge branch 'master' of github.com:dasmoth/dalliance
Use standard Array.prototype.forEach
Fix missing import.
Fix inadvertant rounding error in Browser.move.
Don't try to config-ify track hub tracks without bigDataUrls.
Merge branch '0.12.x'

Conflicts:
	js/cbrowser.js
	package.json
User our own slider for zooming.
Script tags for new zoom slider.