Apply bundler gem template recommendations

exe/crono

@@ -0,0 +1,14 @@
+#!/usr/bin/env ruby
+
+$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
+
+require 'crono/cli'
+
+begin
+  Crono::CLI.instance.run
+rescue => e
+  raise e if $DEBUG
+  STDERR.puts e.message
+  STDERR.puts e.backtrace.join("\n")
+  exit 1
+end