Using modern Objective C syntax: literals for arrays and dictionaries

Updated the machine.m template to use @[] and @{} literal syntax for arrays and dictionaries. 
These changes are enabled by the existing **literals** template-var.

Also, i think you can close https://github.com/rentzsch/mogenerator/pull/120 since these changes have been merged with https://github.com/rentzsch/mogenerator/pull/159 as far as i can tell.