Add OS X to travis; fix tests to pass on OS X
diff --git a/.travis.yml b/.travis.yml
index 93013b8..b2e7394 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,7 @@
 language: cpp
+os:
+  - linux
+  - osx
 script: ./autogen.sh && ./configure && make distcheck
 notifications:
   email: false