Add wiki URLs to console output; fixes #342
Add wiki URLs to console output; fixes #342

Note this will only work in the browser.
Also adds a `url` property to LintError & LintWarning.

Closes #353

freezy-sk/bootlint,chrismbarr/bootlint,chrismbarr/bootlint,twbs/bootlint,freezy-sk/bootlint,freezy-sk/bootlint,twbs/bootlint,chrismbarr/bootlint