Merge pull request #384 from envato/viraptor/short-backtrace

Show a short backtrace on error

Author: viraptor

lib/stack_master/command.rb

@@ -42,6 +42,7 @@ def success?
     def error_message(e)
       msg = "#{e.class} #{e.message}"
       msg << "\n Caused by: #{e.cause.class} #{e.cause.message}" if e.cause
+      msg << "\n at #{e.cause.backtrace[0..3].join("\n    ")}\n ..." if e.cause && !options.trace
       if options.trace
         msg << "\n#{backtrace(e)}"
       else