Explicitly prefer top level VIM module

Hopefully resolves #6.

autoload/nrepl/foreplay_connection.vim

@@ -178,11 +178,13 @@ endif
 ruby <<
 require 'timeout'
 require 'socket'
-def VIM.string_encode(str)
+class << ::VIM
-  '"' + str.gsub(/[\000-\037"\\]/) { |x| "\\%03o" % (x.respond_to?(:ord) ? x.ord : x[0]) } + '"'
+  def string_encode(str)
-end
+    '"' + str.gsub(/[\000-\037"\\]/) { |x| "\\%03o" % (x.respond_to?(:ord) ? x.ord : x[0]) } + '"'
-def VIM.let(var, value)
+  end
-  VIM.command("let #{var} = #{string_encode(value)}")
+  def let(var, value)
+    VIM.command("let #{var} = #{string_encode(value)}")
+  end
 end
 .