Installation relies on $TMP environment variable on Ubuntu

[alexpercsi]

The $TMP environment variable is not available by default in Ubuntu and as such the installation fails with the following error message:

Installing sproutcore as global dependency, this can take a while...
error when checking out: { [Error: Command failed: fatal: could not create leading directories of '/sproutcoreBT_1400760994332/sproutcore': Permission denied
] killed: false, code: 128, signal: null }
sproutcore@0.1.0 node_modules/sproutcore
├── commander@2.2.0
├── cssmin@0.4.1
├── rimraf@2.2.8
├── ejs@1.0.0
├── uglify-js@2.4.13 (uglify-to-browserify@1.0.2, async@0.2.10, optimist@0.3.7, source-map@0.1.33)
├── node-sass@0.8.6 (node-watch@0.3.4, mkdirp@0.3.5, nan@0.8.0, chalk@0.4.0, optimist@0.6.1, mocha@1.18.2, sinon@1.10.0)
├── sproutnode@1.10.3
└── canvas@0.13.1

[mauritslamers]

Fixed in ded0cf3, Thanks a lot for reporting!