added saturday theme

examples/saturday.prytheme

@@ -0,0 +1,37 @@
+---
+meta:
+  theme-name:   "Saturday-night"
+  version:      3
+  color-depth:  256
+  description:  A modification of "tommorow night"
+  author:       John Mair (banisterfiend)
+
+theme:
+  comment:              slate_gray
+  class:                violaceous04
+  error:                black (u) on maroon
+  class_variable:       gray05 (b)
+  instance_variable:    gray05
+  global_variable:      red
+  constant:             violaceous04
+  float:                lilac01
+  integer:              cornflower_blue03
+  keyword:              alizarin
+  method:               cornflower_blue03
+  predefined_constant:  cyan
+  regexp:
+    self:       alizarin
+    content:    alizarin
+    delimiter:  alizarin
+    modifier:   lilac01
+    function:   alizarin
+  shell:
+    self:       toad_in_love
+    content:    green
+    delimiter:  green
+  string:
+    self:       old_gold
+    modifier:   old_gold
+    escape:     old_gold
+    delimiter:  old_gold
+  symbol:       old_gold (b)