provide options for specifying the server host

shard.yml

@@ -1,5 +1,5 @@
 name: action-controller
-version: 0.1.0
+version: 0.1.2
 
 dependencies:
   habitat:

src/action-controller.cr

@@ -2,7 +2,7 @@ require "logger"
 require "habitat"
 
 module ActionController
-  VERSION = "0.1.0"
+  VERSION = "0.1.2"
 
   class Error < ::Exception
   end

src/action-controller/server.cr

@@ -4,17 +4,19 @@ class ActionController::Server
   @server : HTTP::Server?
   @route_handler = RouteHandler.new
 
-  def initialize(@port : Int32, @before_handlers = [] of HTTP::Handler, @after_handlers = [] of HTTP::Handler)
+  def initialize(@port : Int32, @host = "127.0.0.1", @before_handlers = [] of HTTP::Handler, @after_handlers = [] of HTTP::Handler)
   end
 
+  getter :host
+  getter :port
   getter :before_handlers
   getter :after_handlers
 
   def run
     {% for klass in ActionController::Base::CONCRETE_CONTROLLERS %}
       {{klass}}.draw_routes(self)
     {% end %}
-    @server = HTTP::Server.new(@port, @before_handlers + [route_handler] + @after_handlers).listen
+    @server = HTTP::Server.new(@host, @port, @before_handlers + [route_handler] + @after_handlers).listen
   end
 
   def close