Improves travis-ci config to support ubuntu/centos+gcc, cpplint

Enables build, unittest, cpplint tests in below distributions
* CentOS6 + gcc 4.4
* CentOS7 + gcc 4.8
* Ubuntu 12.04 + gcc 4.6
* Ubuntu 14.04 + gcc 4.8

.travis.yml

@@ -1,26 +1,47 @@
+sudo: required
+dist: trusty
+
 language: cpp
 
-compiler:
-# gcc test is disabled (see #120)
-#  - gcc
-  - clang
+services:
+  - docker
+
+matrix:
+  include:
+    - env:
+      - DIST=centos
+      - VERSION=6
+    - env:
+      - DIST=centos
+      - VERSION=7
+    - env:
+      - DIST=ubuntu
+      - VERSION=12.04
+    - env:
+      - DIST=ubuntu
+      - VERSION=14.04
 
 before_install:
-  - lsb_release -a
-  - uname -a
-  - sudo apt-get -qq update
+  - docker pull ${DIST}:${VERSION}
+  - docker run -w /root --name test -d ${DIST}:${VERSION} sleep infinity
+  - docker cp . test:/root/
+  - if [[ "$DIST$VERSION" == "centos6" ]]; then docker exec test rpm -Uvh http://download.jubat.us/yum/rhel/6/stable/x86_64/jubatus-release-6-2.el6.x86_64.rpm; fi
+  - if [[ "$DIST$VERSION" == "centos7" ]]; then docker exec test rpm -Uvh http://download.jubat.us/yum/rhel/7/stable/x86_64/jubatus-release-7-2.el7.x86_64.rpm; fi
 
 install:
-  # msgpack
-  - sudo apt-get -qq install libmsgpack-dev
-  # oniguruma
-  - wget https://github.com/kkos/oniguruma/releases/download/v5.9.6/onig-5.9.6.tar.gz && tar xvf onig-5.9.6.tar.gz
-  - pushd onig-5.9.6 && ./configure && make && sudo make install && popd
-  - sudo ldconfig
+  - if [[ "$DIST" == "centos" ]]; then docker exec test yum -y install redhat-lsb gcc-c++ bzip2 msgpack-devel oniguruma-devel; fi
+  - if [[ "$DIST" == "ubuntu" ]]; then docker exec test bash -c "apt-get update; apt-get -qq install lsb-release autoconf automake make g++ python2.7 wget tar bzip2 libmsgpack-dev"; fi
+  - if [[ "$DIST" == "ubuntu" ]]; then docker exec test bash -c "wget --no-check-certificate https://github.com/kkos/oniguruma/releases/download/v5.9.6/onig-5.9.6.tar.gz && tar xvf onig-5.9.6.tar.gz && cd onig-5.9.6 && ./configure && make && make install && ldconfig"; fi
+  - if [[ "$DIST$VERSION" == "ubuntu14.04" ]]; then docker exec test ln -sf /usr/bin/python2.7 /usr/bin/python; fi
+
+before_script:
+  - docker exec test lsb_release -a
+  - docker exec test g++ --version
 
 script:
-  - ./waf configure
-  - ./waf build --checkall
+  - docker exec test ./waf configure
+  - docker exec test ./waf build --checkall
+  - docker exec test ./waf cpplint
 
 branches:
   only: