Update themes.yml

Added SocialSign.in theme

data/themes.yml

@@ -187,3 +187,6 @@
 -
   :name: 'Grooveshark'
   :colors: '#181D27,#FD6540,#393F40,#F1F2F4,#393F40,#F1F2F4,#F1F2F4,#FD6540'
+-
+  :name: 'SocialSign.in'
+  :colors: '#112539,#112539,#2DA89C,#FFFFFF,#004365,#FFFFFF,#2DEBAE,#2DEBAE'