Allow task deps and params to be single values or arrays

lib/rscons/task.rb

@@ -183,10 +183,10 @@ module Rscons
         @desc = options[:desc]
       end
       if options.include?(:deps)
-        @deps += options[:deps]
+        @deps += Array(options[:deps])
       end
       if options.include?(:params)
-        options[:params].each do |param|
+        Array(options[:params]).each do |param|
           @params[param.name] = param
         end
       end