separated out ip ban logic from regular bans, users can no longer register if an ip ban is in place

app/models/ip_ban.rb

@@ -0,0 +1,9 @@
+class IpBan < ActiveRecord::Base
+  belongs_to :creator, :class_name => "User"
+  validates_presence_of :reason
+  validates_uniqueness_of :ip_addr
+  
+  def self.is_banned?(ip_addr)
+    exists?(["ip_addr = ?", ip_addr])
+  end
+end