Add support for swift source files

lib/cocoapods/sandbox/file_accessor.rb

@@ -12,7 +12,7 @@ module Pod
       GLOB_PATTERNS = {
         :readme              => 'readme{*,.*}'.freeze,
         :license             => 'licen{c,s}e{*,.*}'.freeze,
-        :source_files        => '*.{h,hpp,hh,m,mm,c,cpp}'.freeze,
+        :source_files        => '*.{h,hpp,hh,m,mm,c,cpp,swift}'.freeze,
         :public_header_files => "*{#{HEADER_EXTENSIONS.join(',')}}".freeze,
       }.freeze
 

spec/unit/sandbox/file_accessor_spec.rb

@@ -215,7 +215,7 @@ module Pod
           file_patterns = ['Classes/*.{h,m,d}', 'Vendor']
           options = {
             :exclude_patterns => ['Classes/**/osx/**/*', 'Resources/**/osx/**/*'],
-            :dir_pattern => '*.{h,hpp,hh,m,mm,c,cpp}',
+            :dir_pattern => "*.{h,hpp,hh,m,mm,c,cpp,swift}",
             :include_dirs => false,
           }
           @spec.exclude_files = options[:exclude_patterns]