rpx 6.x-1.0-rc1

Changes since DRUPAL-6--1:

• ensure variables do not become stale between posts.
• added style to space provider icons.
• A series of changes to include a new standardized RPX class for remote calls to the RPX server. Added several new providers. Allow the use of usernames/emails other than those suggested by your OpenID identity. All the RPX Sign-in block title to be changed. Provide uninstall methods. Allow admins to choose which Providers will be displayed based on what is enabled in the RPX account.
• rweishar: fixed problems dealing with realms and SSL. Fixed update provider link on configuration page.
• Allow admin to force the Enabled Providers list to be refreshed from the RPX servers.
• rweishar: added logic to prevent admin settings page from doing a double lookup rp. api key is now the only piece of info necessary to setup RPX. added ability to set signin label. identity providers are no longer displayed as checkboxes since the widget does not respect this.
• Fix sign-in block to allow block title to be overridden. #511206
• Fixed wrong permission string to access settings page. Changed to "administer site configuration". See issue #564546.
• Add default drupal validation of username and email during RPX registration. #589432
• Use full php open tag and remove php closing tag per Drupal standards. #612076
• Fixes to redirection on RPX login and registration. Users will be returned to the page they initiated RPX sign-in from unless they began at the login or registration page, in which case they will land on their user account page. #582358