Address bug in single sign on

If the client sites SSO url contained the sites name, the app would get stuck
in a redirect loop.  Checking the domain instead of the site name fixes this.
Fix misaligned text logo on dozuki sites without custom logos
Fix logged-out crash on Favorite Guides

5.0 introduced an IllegalArgumentException on ContentResolver.isSyncActive if
  the account is null.  Easily solvable - just do a null check before calling.
Merge pull request #236 from iFixit/single-sign-on-fix

Address bug in single sign on