Add expect (5.45) package

Expect is a tool for automating interactive applications such as telnet,
ftp, passwd, fsck, rlogin, tip, etc. Expect really makes this stuff
trivial. Expect is also useful for testing these same applications.

Tested as working properly on Samsung XE50013-K01US.

packages/expect.rb

+require 'package'
+
+class Expect < Package
+  version '5.45'
+  source_url 'http://prdownloads.sourceforge.net/expect/expect5.45.tar.gz'
+  source_sha1 'e634992cab35b7c6931e1f21fbb8f74d464bd496'
+
+  depends_on "tcl"
+
+  def self.build
+    system "./configure", "--prefix=/usr/local"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end