No bug - Add BASE to check_head_headers.sh. r=trivial
Bug 799734 - Pre: Add Utils.byte2hex(String, int).
Bug 799734 - Part 1: Add HTTP client for verifying BrowserID assertions.
Bug 799734 - Part 2: Implement generating BrowserID certificates and assertions.
Bug 799732 - Implement TokenServerClient for interacting with token server service.