updated markdown engine to kramdown

_config.yml

-highligher: pygments
-markdown: redcarpet
-redcarpet:
-  extensions: ["tables","smart","no_intra_emphasis","fenced_code_blocks","autolink"]
+markdown: kramdown
+kramdown:
+  input: GFM
+  hard_wrap: false
+syntax_highlighter: rouge
+
 encoding: utf-8
 url: http://into-cps.github.io