Enable osx in Travis

Newer xcode doesn't include pip, so we have to use get-pip to install
pip for sphinx on OSX.

.travis.yml

@@ -1,3 +1,6 @@
+os:
+  - linux
+  - osx
 language: cpp
 dist: trusty
 sudo: required
@@ -26,17 +29,7 @@ matrix:
       env: COMPILER=g++-5
 
 before_install:
-  - sudo apt-get update -qq
-  - if [ "$COMPILER" = "g++-4.9" ]; then sudo apt-get install -qq g++-4.9; fi
-  - if [ "$COMPILER" = "g++-4.9" ]; then export CXX="g++-4.9" CC="gcc-4.9"; fi
-  - if [ "$COMPILER" = "g++-5" ]; then sudo apt-get install -qq g++-5; fi
-  - if [ "$COMPILER" = "g++-5" ]; then export CXX="g++-5" CC="gcc-5"; fi
-  - sudo apt-get install -y libboost-all-dev
-  - sudo apt-get install -y gperf
-  - sudo apt-get install -y libevent-dev
-  - sudo apt-get install -y uuid-dev
-  - sudo apt-get install -y python-sphinx
-  - sudo apt-get install -y libhiredis-dev
+  - . scripts/travis-$TRAVIS_OS_NAME.sh
 
 script:
   - ./bootstrap.sh -a

scripts/travis-linux.sh

@@ -0,0 +1,7 @@
+sudo apt-get update -qq
+COMPILER_PACKAGE=""
+if [ "$COMPILER" = "g++-4.9" ]; then COMPILER_PACKAGE=g++-4.9
+elif [ "$COMPILER" = "g++-5" ]; then COMPILER_PACKAGE=g++-5; fi
+sudo apt-get install -y libboost-all-dev gperf libevent-dev uuid-dev python-sphinx libhiredis-dev $COMPILER_PACKAGE
+if [ "$COMPILER" = "g++-4.9" ]; then export CXX="g++-4.9" CC="gcc-4.9"
+elif [ "$COMPILER" = "g++-5" ]; then export CXX="g++-5" CC="gcc-5"; fi

scripts/travis-osx.sh

@@ -0,0 +1,7 @@
+#brew install boost
+wget https://bootstrap.pypa.io/get-pip.py
+sudo -H python get-pip.py
+sudo -H pip install virtualenv
+virtualenv sphinx
+. sphinx/bin/activate
+pip install sphinx