travis: extract before_script to other file

.travis.yml

@@ -9,7 +9,7 @@ rvm:
   - 1.9.3
   - 2.0.0
 before_script:
-  - sudo apt-get install -qq -y libgirepository1.0-dev
+  - ./travis-before-script.sh
   - sh -e /etc/init.d/xvfb start
 after_script:
   - sh -e /ext/init.d/xvfb stop

travis-before-script.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+#
+# Copyright (C) 2013  Ruby-GNOME2 Project Team
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+set -e
+set -u
+
+sudo apt-get install -qq -y libgirepository1.0-dev