Add two columns layout and more styles (#82)

Co-authored-by: Atsushi Yasumoto <atsushi@hacarus.com>
Co-authored-by: christophe dervieux <christophe.dervieux@gmail.com>
diff --git a/DESCRIPTION b/DESCRIPTION
index b665124..5a8a41b 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Type: Package
 Package: revealjs
 Title: R Markdown Format for 'reveal.js' Presentations
-Version: 0.9.1.9003
+Version: 0.9.1.9004
 Date: 2017-03-13
 Authors@R: 
     c(person(given = "Hakim",