Update .travis.yml and linux.sh

.travis.yml

@@ -18,6 +18,14 @@ jobs:
    - os: windows
      arch: amd64
 
+cache:
+  bundler: true
+  cocoapods: true
+  ccache: true
+  directories:
+    - .autoconf
+    - $HOME/.m2
+  
 deploy:
   provider: pages
   skip-cleanup: true

travis/linux.sh

@@ -2,7 +2,7 @@
 
 sudo apt-get update
 #sudo apt-get upgrade
-sudo apt-get install make git zlib1g-dev libssl-dev gperf php cmake default-jdk g++
+sudo apt-get install make git zlib1g-dev libssl-dev gperf php cmake default-jdk g++ ccache
 
 cd src/main/jni
 mkdir $TRAVIS_BUILD_DIR/out