Fix autoload of WebDriver::Remote::Bridge::COMMANDS

COMMANDS is defined on WebDriver::Remote::Bridge, but is defined as an
autoload on WebDriver::Remote. Since it's used in
WebDriver::Remote::Bridge#commands (with all the namespaces nested),

Ruby will first look for the constant in WebDriver::Remote::Bridge, then
WebDriver::Remote, where it finds the autoload. It requires the file,
which defines WebDriver::Remote::Bridge::COMMANDS. Then Ruby emits a
warning, because it expected selenium/webdriver/remote/commands to
define WebDriver::Remote::COMMANDS, since that's what the autoload
declares. After that, the constant can be resolved so it still works.

This properly declares the constant as autoloaded under
WebDriver::Remote::Bridge.

rb/lib/selenium/webdriver/remote.rb

@@ -27,7 +27,6 @@ module Remote
       autoload :Driver,       'selenium/webdriver/remote/driver'
       autoload :Response,     'selenium/webdriver/remote/response'
       autoload :Capabilities, 'selenium/webdriver/remote/capabilities'
-      autoload :COMMANDS,     'selenium/webdriver/remote/commands'
 
       module Http
         autoload :Common,  'selenium/webdriver/remote/http/common'

rb/lib/selenium/webdriver/remote/bridge.rb

@@ -21,6 +21,7 @@ module Selenium
   module WebDriver
     module Remote
       class Bridge
+        autoload :COMMANDS, 'selenium/webdriver/remote/bridge/commands'
         include Atoms
 
         PORT = 4444