Fix #17: disable syntax checking when Vim older than 7.3

Author: jimenezrick

README

@@ -28,7 +28,10 @@ Copy the content of the tarball to your `.vim'. Don't forget to run
 `:helptags' if you are not using Pathogen.
 
 Vimerl requires to have a recent version of Erlang installed in your
-system with `escript' in your $PATH and to use Vim 7.3 or newer.
+system with `escript' in your $PATH.
+
+With a Vim version older than 7.3 syntax checking will be disabled as
+some required features won't be available.
 
 
  How to use it

compiler/erlang.vim

@@ -3,9 +3,9 @@
 " Author:       Pawel 'kTT' Salata <[email protected]>
 " Contributors: Ricardo Catalinas Jiménez <[email protected]>
 " License:      Vim license
-" Version:      2012/01/18
+" Version:      2012/01/31
 
-if exists("current_compiler")
+if exists("current_compiler") || v:version < 703
 	finish
 else
 	let current_compiler = "erlang"