Add Zip namespace to DOSTime class

In the top level, it conflicts with the archive-zip library's class of
the same name.

lib/zip/dos_time.rb

@@ -1,43 +1,45 @@
-class DOSTime < Time #:nodoc:all
+module Zip
+  class DOSTime < Time #:nodoc:all
 
-  #MS-DOS File Date and Time format as used in Interrupt 21H Function 57H:
+    #MS-DOS File Date and Time format as used in Interrupt 21H Function 57H:
 
-  # Register CX, the Time:
-  # Bits 0-4  2 second increments (0-29)
-  # Bits 5-10 minutes (0-59)
-  # bits 11-15 hours (0-24)
+    # Register CX, the Time:
+    # Bits 0-4  2 second increments (0-29)
+    # Bits 5-10 minutes (0-59)
+    # bits 11-15 hours (0-24)
 
-  # Register DX, the Date:
-  # Bits 0-4 day (1-31)
-  # bits 5-8 month (1-12)
-  # bits 9-15 year (four digit year minus 1980)
+    # Register DX, the Date:
+    # Bits 0-4 day (1-31)
+    # bits 5-8 month (1-12)
+    # bits 9-15 year (four digit year minus 1980)
 
-  def to_binary_dos_time
-    (sec/2) +
-    (min  << 5) +
-    (hour << 11)
-  end
+    def to_binary_dos_time
+      (sec/2) +
+      (min  << 5) +
+      (hour << 11)
+    end
 
-  def to_binary_dos_date
-    (day) +
-    (month << 5) +
-    ((year - 1980) << 9)
-  end
+    def to_binary_dos_date
+      (day) +
+      (month << 5) +
+      ((year - 1980) << 9)
+    end
 
-  # Dos time is only stored with two seconds accuracy
-  def dos_equals(other)
-    to_i/2 == other.to_i/2
-  end
+    # Dos time is only stored with two seconds accuracy
+    def dos_equals(other)
+      to_i/2 == other.to_i/2
+    end
 
-  def self.parse_binary_dos_format(binaryDosDate, binaryDosTime)
-    second = 2 * (       0b11111 & binaryDosTime)
-    minute = (     0b11111100000 & binaryDosTime) >> 5 
-    hour   = (0b1111100000000000 & binaryDosTime) >> 11
-    day    = (           0b11111 & binaryDosDate) 
-    month  = (       0b111100000 & binaryDosDate) >> 5
-    year   = ((0b1111111000000000 & binaryDosDate) >> 9) + 1980
-    begin
-      return self.local(year, month, day, hour, minute, second)
+    def self.parse_binary_dos_format(binaryDosDate, binaryDosTime)
+      second = 2 * (       0b11111 & binaryDosTime)
+      minute = (     0b11111100000 & binaryDosTime) >> 5 
+      hour   = (0b1111100000000000 & binaryDosTime) >> 11
+      day    = (           0b11111 & binaryDosDate) 
+      month  = (       0b111100000 & binaryDosDate) >> 5
+      year   = ((0b1111111000000000 & binaryDosDate) >> 9) + 1980
+      begin
+        return self.local(year, month, day, hour, minute, second)
+      end
     end
   end
 end