Merge branch 'jdsimcoe-master'

data/themes.yml

@@ -244,3 +244,6 @@
   :colors: '#F5F5F5,#CCCCCC,#3873AE,#FFFFFF,#E9E9E9,#000000,#69AA4E,#999999'
   :name: 'Space Gray'
   :colors: '#303E4D,#2C3849,#B04C58,#FFFFFF,#4A5664,#B3B8C4,#94E864,#78AF8F'
+- 
+  :name: 'Slack.com'
+  :colors: '#573D82,#453068,#3FBA91,#FFFFFF,#453068,#FFFFFF,#3FBA91,#FF3E88'