Add gzsize (0.1.1) package

GZSize is a lightweight tool to measure the decompressed size of a
GZip'd file.

Tested as working on Samsung XE50013-K01US (x86_64).

packages/gzsize.rb

+require 'package'
+
+class Gzsize < Package
+  version '0.1.1'
+  source_url 'https://github.com/bfontaine/gzsize/archive/0.1.1.tar.gz'
+  source_sha1 '778820b0bf3fc2197955b60c6dc49f6fac00878b'
+
+  def self.build
+    system "make"
+  end
+
+  def self.install
+    system "mkdir", "-p", "#{CREW_DEST_DIR}/usr/local/bin"
+    system "mkdir", "-p", "#{CREW_DEST_DIR}/usr/local/man/man1"
+    FileUtils.cp "gzsize", "#{CREW_DEST_DIR}/usr/local/bin/gzsize"
+    FileUtils.cp "man/gzsize.1", "#{CREW_DEST_DIR}/usr/local/man/man1/gzsize.1"
+  end
+end