Land rapid7#1859, fix trailing newlines in zip.

This incidentally fixes rapid7#1755 for real, where most of the discussion
of this bug took place.

Author: Tod Beardsley

lib/zip/zip.rb

@@ -1259,6 +1259,8 @@ def read_e_o_c_d(io) #:nodoc:
       @cdirOffset                           = ZipEntry::read_zip_long(buf)
       commentLength                         = ZipEntry::read_zip_short(buf)
       @comment                              = buf.read(commentLength)
+			# remove trailing \n symbol
+			buf.chomp!
       raise ZipError, "Zip consistency problem while reading eocd structure" unless buf.size == 0
     end