Add Abiword 2.8.6 formula.

Closes Homebrew/homebrew#3721.

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

Formula/abiword.rb

@@ -0,0 +1,22 @@
+require 'formula'
+
+class Abiword <Formula
+  url 'http://www.abisource.com/downloads/abiword/2.8.6/source/abiword-2.8.6.tar.gz'
+  homepage 'http://www.abisource.com/'
+  md5 'f883b0a7f26229a9c66fd6a1a94381aa'
+
+  depends_on 'jpeg'
+  depends_on 'fribidi'
+  depends_on 'libgsf'
+  depends_on 'enchant'
+  depends_on 'cairo'
+  depends_on 'pango'
+  depends_on 'imagemagick'
+
+  def install
+    ENV.libpng
+    system "./configure", "--disable-debug", "--disable-dependency-tracking",
+                          "--prefix=#{prefix}"
+    system "make install"
+  end
+end