Add Travis continuous integration

This enables building of the CCAN and running of all the tests on
https://travis-ci.org/Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

.travis.yml

+language: c
+
+install:
+        - sudo apt-get update -qq
+        # jset, jmap
+        - sudo apt-get install libjudy-dev
+        # wwviaudio
+        - sudo apt-get install libvorbis-dev libportaudio-dev
+        # tal
+        - sudo apt-get install libtalloc-dev
+
+script:
+        - make
+        - make check