Added check to prevent loading plugin twice

Author: ejsexton82

plugin/vdebug.vim

@@ -18,6 +18,17 @@
 "=============================================================================
 " }}}
 
+" Sanity Checks
+
+if exists('g:is_vdebug_loaded')
+    finish
+endif
+
+" Set a special flag used only by this plugin for preventing doubly
+" loading the script.
+let g:is_vdebug_loaded = 1
+
+
 " Do not source this script when python is not compiled in.
 if !has("python")
     finish