[PathList] Fix support for patterns ending with a slash.

See #859

lib/cocoapods/sandbox/path_list.rb

@@ -95,7 +95,10 @@ module Pod
 
         list = Array(patterns).map do |pattern|
           if pattern.is_a?(String)
-            pattern += '/' + dir_pattern if directory?(pattern) && dir_pattern
+            if directory?(pattern) && dir_pattern
+              pattern += '/' unless pattern.end_with?('/')
+              pattern +=  dir_pattern
+            end
             expanded_patterns = dir_glob_equivalent_patterns(pattern)
             full_list.select do |path|
               expanded_patterns.any? do |p|

spec/unit/sandbox/path_list_spec.rb

@@ -80,6 +80,15 @@ module Pod
         ]
       end
 
+      it "handles directories specified with a trailing slash" do
+        paths = @path_list.relative_glob('Classes/', { :dir_pattern => '*.{h,m}'} ).map(&:to_s)
+        paths.sort.should == %w[
+          Classes/Banana.h
+          Classes/Banana.m
+          Classes/BananaPrivate.h
+        ]
+      end
+
       it "supports an optional list of patterns to exclude" do
         exclude_patterns = ['**/*.m', '**/*Private*.*']
         paths = @path_list.relative_glob('Classes/*', { :exclude_patterns => exclude_patterns }).map(&:to_s)