bin/ona in ona-0.1.2 vs bin/ona in ona-0.1.3

@@ -2,9 +2,13 @@
 
 require 'rubygems'
 require 'readline'
 require 'ona'
 
+unless File.exists? 'Onafile'
+  abort 'Please create a file named:[Onafile] to start the shell.'
+end
+
 stack = Ona::Stack.new
 eval File.read 'Onafile'
 cli = Ona::Cli.new(stack)
 
 loop do