Add vimpager formula

Remove unnecessary mv call.

Tricksy homebrews.

Add caveat for setting up vimpager

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/vimpager.rb

@@ -0,0 +1,18 @@
+require 'formula'
+
+class Vimpager < Formula
+  url 'http://www.vim.org/scripts/download_script.php?src_id=13024'
+  version '1.3'
+  homepage 'http://www.vim.org/scripts/script.php?script_id=1723'
+  md5 '2ace56c96fb47cd6f34e47b2d6707729'
+
+  def install
+    bin.install 'download_script.php?src_id=13024' => 'vimpager'
+  end
+
+  def caveats; <<-EOS.undent
+    To use vimpager as your default pager, add `export PAGER=vimpager` to your
+    shell configuration.
+    EOS
+  end
+end