Merge branch 'master', remote-tracking branch 'remotes/upstream/master'

* remotes/upstream/master:
  don't delete contact from a friend request if friendship was already established
  quattro: move quattro-green inside quattro folder. Add config option to select quattro color scheme.
  allow themes to use "style.php" instead of "style.css". Load style.php trhu mod/view.php to pass it friendica framework.
  css-fixes in diabook-derivates
  css-fixes in diabook-derivates
  quattro-green: remove settings code Use config.php from quattro
  quattro: add config.php
  settings: add "display settings" tab, with UI-related settings. Load optional "config.php" from theme folder and show in page. Loading of "config.php" follow theme_info['extends'] property.
  catch OpenID login errors in cases when the OpenID server does not answers
  css-fixes in diabook-derivates
  quattro-green: added Description to the theme.php

* master: