attempt to run osx on travis

.travis.yml

@@ -4,23 +4,30 @@ rust:
     - 1.4.0
 
 os:
-    - linux
-    #- osx
+    #- linux
+    - osx
 
 before_script:
     # g++4.8 for C++11 which is required by rocksdb
-    - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-    - sudo apt-get update -y -qq
-    - sudo apt-get install -qq --yes --force-yes g++-4.8
-    - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50
+    - if [ $TRAVIS_OS_NAME == "linux" ]; then 
+        sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+        sudo apt-get update -y -qq
+        sudo apt-get install -qq --yes --force-yes g++-4.8
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50
 
-    - wget https://github.com/facebook/rocksdb/archive/rocksdb-3.13.tar.gz
-    - tar xvf rocksdb-3.13.tar.gz && cd rocksdb-rocksdb-3.13 && make shared_lib
-    - sudo make install
-    - cd ..
+        wget https://github.com/facebook/rocksdb/archive/rocksdb-3.13.tar.gz
+        tar xvf rocksdb-3.13.tar.gz && cd rocksdb-rocksdb-3.13 && make shared_lib
+        sudo make install
+        cd ..
+      else
+        brew update
+        brew install rocksdb
+      fi
 
 after_success:
-    - sudo apt-get install libcurl4-openssl-dev libelf-dev libdw-dev
-    - wget https://github.com/SimonKagstrom/kcov/archive/master.tar.gz
-    - tar xzf master.tar.gz && mkdir kcov-master/build && cd kcov-master/build && cmake .. && make && sudo make install && cd ../.. &&
-    - kcov --coveralls-id=$TRAVIS_JOB_ID --exclude-pattern=/.cargo target/kcov target/debug/ethcore_util-*
+    - if [ $TRAVIS_OS_NAME == "linux" ]; then 
+        sudo apt-get install libcurl4-openssl-dev libelf-dev libdw-dev
+        wget https://github.com/SimonKagstrom/kcov/archive/master.tar.gz
+        tar xzf master.tar.gz && mkdir kcov-master/build && cd kcov-master/build && cmake .. && make && sudo make install && cd ../.. &&
+        kcov --coveralls-id=$TRAVIS_JOB_ID --exclude-pattern=/.cargo target/kcov target/debug/ethcore_util-*
+      fi