Allow for disabling individual languages, closes #66

ftplugin/rust.vim

@@ -1,3 +1,5 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'rust') == -1
+  
 " Language:     Rust
 " Description:  Vim syntax file for Rust
 " Maintainer:   Chris Morgan <me@chrismorgan.info>
@@ -148,3 +150,5 @@ let &cpo = s:save_cpo
 unlet s:save_cpo
 
 " vim: set noet sw=4 ts=4:
+
+endif