Merge pull request #538 from am11/master

CI: Use env.SKIP_SASS_BINARY_DOWNLOAD_FOR_CI

.travis.yml

 language: node_js
+env:
+  SKIP_SASS_BINARY_DOWNLOAD_FOR_CI=true
+
 compiler:
   - gcc
 node_js:
@@ -10,7 +13,7 @@ before_install:
   - sudo apt-get install gcc-4.8 g++-4.8;
   - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 20;
   - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 20;
-  - sudo g++ --version;
+  - g++ --version;
   - sudo apt-get update -qq;
 
   - git submodule update --init --recursive

appveyor.yml

@@ -4,6 +4,7 @@ init:
   - git config --global core.autocrlf input
 
 environment:
+  SKIP_SASS_BINARY_DOWNLOAD_FOR_CI: true
   matrix:
     - nodejs_version: 0.10.32
     - nodejs_version: 0.11.13

scripts/install.js

@@ -60,7 +60,7 @@ function fetch(name) {
  * Skip if CI
  */
 
-if (process.env.CI || process.env.APPVEYOR) {
+if (process.env.SKIP_SASS_BINARY_DOWNLOAD_FOR_CI) {
   console.log('Skipping downloading binaries on CI builds');
   return;
 }