fix(travis): Add support for Node 4.2 LTS, C++11

commit 95ab064d24fdaf38a846987b88494a62f9acd87a
Author: mbilker <me@mbilker.us>
Date:   Sat Nov 21 23:31:32 2015 -0500

    fix(travis): use GCC 4.8 on 0.10 and 0.12 due to newer NAN library in dependent packages

commit 92cb159fd99c05729f6c7867c848be7383847a92
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 12 20:42:30 2015 -0500

    fix(travis): switch from node 4.1 to 4.2 and add node 5

commit 973aacfdb7df72f6e3da549087492d8cb4388282
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 23:44:42 2015 -0500

    fix(travis): display gcc version that corresponds to the CC variable

commit 6b4f907719b03924308ee33ad869d498277f15ae
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 23:34:11 2015 -0500

    fix(travis): reenable osx node 0.12 build

commit c3cb97f2db9113140e374aefb8fc71a8d150593d
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 23:33:40 2015 -0500

    add(travis): display gcc version

commit 71f3eb619d2bc7c6bc26bce11792622902ab982e
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 23:28:45 2015 -0500

    fix(travis): set compiler in env declaration

commit 0b694230211bedd8a603810cb7959652e33f3bf1
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 23:25:46 2015 -0500

    fix(travis): print currently used compiler in CC and CXX

commit 9ca898b543b7a97bf77c11837085eb43f18872d1
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 23:22:07 2015 -0500

    fix(travis): install c++11 supported compilers

commit e728ee7de9015e0ac945cadc744e2bca61c0731b
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 23:07:35 2015 -0500

    fix(travis): print clang version, disable frequently failing build configs

commit 8d6cf314b0d23a2e6bee1d6e543ef81dad5f4ffd
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 22:30:48 2015 -0500

    fix(travis): delete npm prefix for node 4.1

commit b7cf33eac8ca07a7013c9248b3e90990b01cec39
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 22:26:20 2015 -0500

    fix(travis): nvm complains on os x about npm prefix

commit 670168e4103cdd2d6eaddd32796dc581d0107a7c
Author: mbilker <me@mbilker.us>
Date:   Thu Nov 5 22:19:25 2015 -0500

    add(travis): test node 4.1 under linux and os x

.travis.yml

@@ -2,33 +2,53 @@ env:
   global:
     - NYLAS_ACCESS_TOKEN=cb200be7c921f73a1c35930f6a4ac8758b271be0
 
-compiler: clang
+compiler:
+  - clang
+  - gcc
 
 matrix:
   include:
+# Wants a c++11 compiler
     - os: linux
-      env: NODE_VERSION=0.10
+      env: NODE_VERSION=0.10 CC=gcc-4.8 CXX=g++-4.8
     - os: linux
-      env: NODE_VERSION=0.12
+      env: NODE_VERSION=0.12 CC=gcc-4.8 CXX=g++-4.8
+    - os: linux
+      env: NODE_VERSION=4.2 CC=gcc-4.8 CXX=g++-4.8
+    - os: linux
+      env: NODE_VERSION=5 CC=gcc-4.8 CXX=g++-4.8
     - os: osx
       env: NODE_VERSION=0.10
     - os: osx
-      env: NODE_VERSION=0.12
+      env: NODE_VERSION=0.12 CC=clang CXX=clang++
+# osx already supports c++11 in Apple LLVM
+    - os: osx
+      env: NODE_VERSION=4.2 CC=clang CXX=clang++
+    - os: osx
+      env: NODE_VERSION=5 CC=clang CXX=clang++
 
 sudo: false
 
 install:
+  - echo $CC
+  - echo $CXX
+  - clang --version
+  - if [ "$CC" = "gcc-4.8" ]; then gcc-4.8 -v; else gcc -v; fi
   - git clone https://github.com/creationix/nvm.git /tmp/.nvm
   - source /tmp/.nvm/nvm.sh
   - nvm install $NODE_VERSION
-  - nvm use $NODE_VERSION
+  - nvm use --delete-prefix $NODE_VERSION
 
 script: script/cibuild
 
 addons:
   apt:
+    sources:
+    - ubuntu-toolchain-r-test
     packages:
     - build-essential
+    - clang
+    - fakeroot
+    - g++-4.8
     - git
     - libgnome-keyring-dev
-    - fakeroot