Remove Entry#dirty= as 'dirtyness' is now monitored internally.

Had to round out some of the accessors that mark an `Entry` as dirty.

lib/zip/entry.rb

@@ -23,12 +23,13 @@ class Entry
                   :restore_ownership, :restore_permissions, :restore_times,
                   :size, :unix_gid, :unix_perms, :unix_uid
 
-    attr_accessor :crc, :dirty, :external_file_attributes, :fstype, :gp_flags,
+    attr_accessor :crc, :external_file_attributes, :fstype, :gp_flags,
                   :internal_file_attributes, :local_header_offset # :nodoc:
 
     attr_reader :extra, :compression_level, :ftype, :filepath # :nodoc:
 
-    mark_dirty :comment=, :compressed_size=, :name=, :size=,
+    mark_dirty :comment=, :compressed_size=, :external_file_attributes=,
+               :fstype=, :gp_flags=, :name=, :size=,
                :unix_gid=, :unix_perms=, :unix_uid=
 
     def set_default_vars_values

lib/zip/filesystem/file.rb

@@ -124,7 +124,6 @@ def chmod(mode, *filenames)
           e.fstype = FSTYPE_UNIX # Force conversion filesystem type to unix.
           e.unix_perms = mode
           e.external_file_attributes = mode << 16
-          e.dirty = true
         end
         filenames.size
       end

test/entry_set_test.rb

@@ -60,16 +60,18 @@ def test_delete
   def test_each
     # Used each instead each_with_index due the bug in jRuby
     count = 0
+    new_size = 200
     @zip_entry_set.each do |entry|
       assert(ZIP_ENTRIES.include?(entry))
-      assert(entry.dirty)
-      entry.dirty = false # Check that entries can be changed in this block.
+      entry.clean_up # Start from a "saved" state.
+      entry.size = new_size # Check that entries can be changed in this block.
       count += 1
     end
 
     assert_equal(ZIP_ENTRIES.size, count)
     @zip_entry_set.each do |entry|
-      refute(entry.dirty)
+      assert_equal(new_size, entry.size)
+      assert(entry.dirty?) # Size was changed.
     end
   end