Move to flat_map now that we don't use 1.8

middleman-core/lib/middleman-core/util.rb

@@ -139,15 +139,14 @@ module Middleman
     # @param paths Some paths string or Pathname
     # @return [Array] An array of filenames
     def self.all_files_under(*paths)
-      # when we drop 1.8, replace this with flat_map
-      paths.map do |p|
+      paths.flat_map do |p|
         path = Pathname(p)
         if path.directory?
           all_files_under(*path.children)
         elsif path.file?
           path
         end
-      end.flatten.compact
+      end.compact
     end
 
     # Given a source path (referenced either absolutely or relatively)

middleman-core/spec/spec_helper.rb

@@ -2,4 +2,4 @@ require 'simplecov'
 SimpleCov.root(File.expand_path(File.dirname(__FILE__) + '/..'))
 
 require 'coveralls'
-Coveralls.wear!
+Coveralls.wear!