Clutching at straws to accomodate TravisCI

Due to the stack trace below, I'm explicitly setting Travis to run with
IPv4 only, as my suspicion is that the failure it could be something
related to the particular IP version.

Exception in thread "main" java.net.SocketException: Protocol family
unavailable, compiling:(/tmp/form-init712554124418660207.clj:1:72)

	at clojure.lang.Compiler.load(Compiler.java:7239)
	at clojure.lang.Compiler.loadFile(Compiler.java:7165)
	at clojure.main$load_script.invoke(main.clj:275)
	at clojure.main$init_opt.invoke(main.clj:280)
	at clojure.main$initialize.invoke(main.clj:308)
	at clojure.main$null_opt.invoke(main.clj:343)
	at clojure.main$main.doInvoke(main.clj:421)
	at clojure.lang.RestFn.invoke(RestFn.java:421)
	at clojure.lang.Var.invoke(Var.java:383)
	at clojure.lang.AFn.applyToHelper(AFn.java:156)
	at clojure.lang.Var.applyTo(Var.java:700)
	at clojure.main.main(main.java:37)
Caused by: java.net.SocketException: Protocol family unavailable
	at java.net.PlainSocketImpl.socketBind(Native Method)
	at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:376)
	at java.net.ServerSocket.bind(ServerSocket.java:376)
	at java.net.ServerSocket.bind(ServerSocket.java:330)
	at clojure.tools.nrepl.server$start_server.doInvoke(server.clj:147)

Author: dotemacs

project.clj

@@ -35,4 +35,5 @@
                    :java-source-paths ["test/java"]
                    :resource-paths ["test/resources"
                                     "test/resources/testproject/src"]
-                   :repositories [["snapshots" "http://oss.sonatype.org/content/repositories/snapshots"]]}})
+                   :repositories [["snapshots" "http://oss.sonatype.org/content/repositories/snapshots"]]}}
+  :jvm-opts ["-Djava.net.preferIPv4Stack=true"])