Add a travis config.

Change-Id: I9681c38510cf9535464c20133b61190bf663070c
Reviewed-on: http://gerrit.dmdirc.com/3241
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

.travis.yml

@@ -0,0 +1,4 @@
+language: java
+jdk:
+  - oraclejdk7
+  - openjdk7