Migrate Travis to container-based infrastructure

* http://docs.travis-ci.com/user/migrating-from-legacy/?utm_source=legacy-notice&utm_medium=banner&utm_campaign=legacy-upgrade

bin/sh/install-boost.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+# Assumptions:
+# 1) BOOST_ROOT and BOOST_URL are already defined,
+# and contain valid values.
+# 2) The last namepart of BOOST_ROOT matches the
+# folder name internal to boost's .tar.gz
+set -e
+if [ ! -d "$BOOST_ROOT/lib" ]
+then
+  wget $BOOST_URL -O /tmp/boost.tar.gz
+  cd `dirname $BOOST_ROOT`
+  tar xzf /tmp/boost.tar.gz
+  cd $BOOST_ROOT && \
+    ./bootstrap.sh --prefix=$BOOST_ROOT && \
+      ./b2 -d1 && ./b2 -d0 install
+else
+  echo "Using cached boost at $BOOST_ROOT"
+fi
+