[3.5.4] Enabled ccache for faster builds (#87)

* Enabled ccache for faster builds

* ccache for mac osx travis config.

Author: Omer Katz

.travis.yml

@@ -3,6 +3,8 @@ language: cpp
 compiler:
   - clang
   - gcc
+  
+cache: ccache  
 
 os:
   - linux
@@ -26,8 +28,11 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install llvm --with-clang; fi
 
 install:
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install ccache; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export PATH="/usr/local/opt/ccache/libexec:$PATH"; fi
   - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install redis; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then (redis-server&); fi
 
 script: mkdir build && cd build && cmake .. -DBUILD_TESTS=true -DBUILD_EXAMPLES=true && make && ./bin/cpp_redis_tests
+