trying Travis and OSX

.travis.yml

@@ -44,6 +44,13 @@ matrix:
           sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.7']
           packages: ['clang-3.7', 'valgrind']
       env: COMPILER=clang++-3.7
+     
+    - os: osx
+      compiler: clang
+      env: COMPILER=clang
+      before_install:
+        - brew update
+        - brew install valgrind
 
 script:
   - make CXX=$COMPILER CXXFLAGS="-lstdc++"