Use gcc 4.8 in travis-ci

[mike-north]

Currently, setting up ember-cli-fastboot with a new app will cause failures in travis-ci. This is because of a known issue, where a different C++ compiler is necessary to build native code in nan (a dependency of contextify). Potentially this problem arises with any kind of native code used w/ node-gyp in iojs3 or node4.

> [email protected] install /home/travis/build/mike-north/peepchat-ui/node_modules/ember-cli-fastboot/node_modules/contextify
> node-gyp rebuild
gyp WARN download NVM_NODEJS_ORG_MIRROR is deprecated and will be removed in node-gyp v4, please use NODEJS_ORG_MIRROR
gyp WARN download NVM_NODEJS_ORG_MIRROR is deprecated and will be removed in node-gyp v4, please use NODEJS_ORG_MIRROR
gyp WARN download NVM_NODEJS_ORG_MIRROR is deprecated and will be removed in node-gyp v4, please use NODEJS_ORG_MIRROR
make: Entering directory `/home/travis/build/mike-north/peepchat-ui/node_modules/ember-cli-fastboot/node_modules/contextify/build'
  CXX(target) Release/obj.target/contextify/src/contextify.o
In file included from ../src/contextify.cc:3:0:
../node_modules/nan/nan.h:41:3: error: #error This version of node/NAN/v8 requires a C++11 compiler
In file included from /home/travis/.node-gyp/4.4.2/include/node/node.h:42:0,
                 from ../src/contextify.cc:1:

This new installation blueprint sets up travis-ci to use the appropriate compiler to compile native code

[stefanpenner]

I think this has been incorporated in the last PR merged

@tomdale c/d

[tomdale]

@stefanpenner If I'm reading this correctly, I think the PR is to add the correct Travis settings to add to apps when the FastBoot addon is installed.

[stefanpenner]

aaaa

[tomdale]

@mike-north Won't this screw up people who already have .jshintrc and .travis.yml files?

[mike-north]

@tomdale it will give users the option to accept this addon's proposed changes to .travis.yml, same as any other installation blueprint. imo this is better than a more complicated programmatic modification of the travis config file, because we'd then lose the ability to show developers what this addon wants to change.

The .jshintrc shouldn't be an issue, since that's outside of the blueprints.

[mike-north]

This is moot now, since the contextify dependency has been removed.