Speed up msfcli help

If the user only wants to see help, then no point to load things
that will actually never be used by msfcli.  Only rex is needed.

msfcli

@@ -16,15 +16,7 @@ while File.symlink?(msfbase)
 end
 
 $:.unshift(File.expand_path(File.join(File.dirname(msfbase), 'lib')))
-require 'fastlib'
-require 'msfenv'
-
-
-$:.unshift(ENV['MSF_LOCAL_LIB']) if ENV['MSF_LOCAL_LIB']
-
 require 'rex'
-require 'msf/ui'
-require 'msf/base'
 
 Indent = '   '
 
@@ -61,6 +53,12 @@ module_class = "exploit"
 
 if(exploit_name == "-h")
 	usage()
+else
+	$:.unshift(ENV['MSF_LOCAL_LIB']) if ENV['MSF_LOCAL_LIB']
+	require 'fastlib'
+	require 'msfenv'
+	require 'msf/ui'
+	require 'msf/base'
 end
 
 # Initialize the simplified framework instance.