some FxA cleanups
use refreshAuthentication in FxOS 2.0 forgot-pin flow (bug 1033712)
Merge pull request #114 from washort/forgot-pin-fxa

use refreshAuthentication in FxOS 2.0 forgot-pin flow (bug 1033712)
Commit from Mozilla Verbatim by user az.: 71 of 71 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user kelemeng.: 71 of 71 strings translated (0 fuzzy).
Require 2.1 for native FxA (bug 1070269)