add changelog to options
README.md: slight clarification on the way options.changelog works
README.md: add link to Packaging Guidelines about RPM %changelog
port %files generation to templating

 All lines in %files block will be generated based on processFiles() function
 using grunt.template.process().

 Side-Effects: Shaves off LOC off of code significantly and makes control-flow
 significantly more concise.

 Also removes reliance on calling chown/chgrp in %post-block.
fix indentation
grunt jsbeautifier run
Merge pull request #43 from andreas-marschke/fix/attrs