Add Ruby unless and Proc.new snippets

snippets/ruby-mode/proc

@@ -0,0 +1,6 @@
+# -*- mode: snippet -*-
+# name: Proc.new { |...| ... }
+# key: proc
+# contributor: Valery Zajkov
+# --
+Proc.new { |${1:argument}| $0 }

snippets/ruby-mode/unless

@@ -0,0 +1,9 @@
+# -*- mode: snippet -*-
+# name: unless ... end
+# group: control structure
+# key: unless
+# contributor: Valery Zajkov
+# --
+unless ${1:condition}
+  $0
+end