[Specification] Keep the user API in present tense for consistency.

lib/cocoapods/local_pod.rb

@@ -536,7 +536,7 @@ module Pod
 
       specs = specs.sort_by { |s| s.name.length }
       specs.each do |spec|
-        paths = expanded_paths(spec.send(accessor), dir_pattern, spec.excluded_patterns)
+        paths = expanded_paths(spec.send(accessor), dir_pattern, spec.exclude_patterns)
         unless paths.empty?
           paths_by_spec[spec] = paths - processed_paths
           processed_paths += paths

lib/cocoapods/specification.rb

@@ -40,7 +40,7 @@ module Pod
 
       # multi-platform attributes
       %w[ source_files
-          excluded_patterns
+          exclude_patterns
           public_header_files
           resources
           preserve_paths
@@ -137,7 +137,7 @@ module Pod
       end
 
       %w{ source_files=
-          excluded_patterns=
+          exclude_patterns=
           public_header_files=
           resource=
           resources=
@@ -261,7 +261,7 @@ module Pod
     top_attr_accessor :prefix_header_contents
 
     pltf_chained_attr_accessor  :source_files,                lambda {|value, current| pattern_list(value) }
-    pltf_chained_attr_accessor  :excluded_patterns,           lambda {|value, current| pattern_list(value) }
+    pltf_chained_attr_accessor  :exclude_patterns,            lambda {|value, current| pattern_list(value) }
     pltf_chained_attr_accessor  :public_header_files,         lambda {|value, current| pattern_list(value) }
     pltf_chained_attr_accessor  :resources,                   lambda {|value, current| pattern_list(value) }
     pltf_chained_attr_accessor  :preserve_paths,              lambda {|value, current| pattern_list(value) } # Paths that should not be cleaned