Merge branch '1.0.x' of gitorious.org:statusnet/mainline into 1.0.x

Merge branch '1.0.x' of gitorious.org:statusnet/mainline into 1.0.x

* '1.0.x' of gitorious.org:statusnet/mainline:
  more verbose, better checks for installforemail
  Check for unavailable site nicknames in DomainStatusNetwork
  Status_network::setupDB() sets up related tables too
  Class to store unavailable status network names
  First version of installer for domain-based status networks
  Ignore empty email whitelist string
  Don't redefine 'STATUSNET' in installer
  move registeremailuser.php back to email registration
  Move common domain-to-network mapping to the plugin module
  move external libs for domains here
  move domain status network scripts
  Revert "Add DomainStatusNetwork plugin"
  add DomainStatusNetwork plugin
  Add DomainStatusNetwork plugin
  utility functions for setting config options in memory
  get a free site nickname by email or domain
  TLD utilities
  script to determine site nickname by domain
  lookup a statusnetwork by tag