Update installation document

Some controllers moved into PasswordReset. Following the guide causes errors when installing 3.0-M3.

Author: aladagemre

docs/src/manual/source/guide/installation.html.md.erb

@@ -67,10 +67,10 @@ Add the routes for SecureSocial into your app's `routes` file:
 	POST    /signup                     securesocial.controllers.Registration.handleStartSignUp
 	GET     /signup/:token              securesocial.controllers.Registration.signUp(token)
 	POST    /signup/:token              securesocial.controllers.Registration.handleSignUp(token)
-	GET     /reset                      securesocial.controllers.Registration.startResetPassword
-	POST    /reset                      securesocial.controllers.Registration.handleStartResetPassword
-	GET     /reset/:token               securesocial.controllers.Registration.resetPassword(token)
-	POST    /reset/:token               securesocial.controllers.Registration.handleResetPassword(token)
+	GET     /reset                      securesocial.controllers.PasswordReset.startResetPassword
+	POST    /reset                      securesocial.controllers.PasswordReset.handleStartResetPassword
+	GET     /reset/:token               securesocial.controllers.PasswordReset.resetPassword(token)
+	POST    /reset/:token               securesocial.controllers.PasswordReset.handleResetPassword(token)
 	GET     /password                   securesocial.controllers.PasswordChange.page
 	POST    /password                   securesocial.controllers.PasswordChange.handlePasswordChange