Fix 1019504 — Update session expires on auth.

When someone authenticates with an existing hawk session, touch the expiration
time so that it continues to be valid.
Merge pull request #90 from mozilla-services/bug/1019504-touch-session

Fix 1019504 — Update session expires on auth.
Make install should install loads from git.
Email information is inside an "idpClaims" namespace.
Udate extra claims fields for FxA.