.travis.yml: test build packages on travis.

common/travis/bootstrap.sh

@@ -0,0 +1,12 @@
+#! /bin/sh
+#
+# bootstrap.sh
+
+mkdir -p hostdir/repocache 
+if [ -d $HOME/repocache ]; then
+	ln $HOME/repocache/* hostdir/repocache;
+else
+	mkdir -p $HOME/repocache
+fi
+
+./xbps-src binary-bootstrap