Relax rule: allow TypeScript Triple-Slash Directives
Relax rule: allow TypeScript Triple-Slash Directives

Documented here:
http://www.typescriptlang.org/docs/handbook/triple-slash-directives.html

Fixes: https://github.com/feross/standard/issues/660

feross/eslint-config-standard,valedaemon/eslint-config-postmodern