Travis CI: Implement automatic deployment of prebuilt versions on each commit, and caching of assets and NVM.

Builds are deployed to prebuilt/dist an prebuilt/module branches.

gulp/tasks/test.js

@@ -36,6 +36,6 @@ gulp.task('test:node', ['minify:acorn'], function(callback) {
                 // present and handles the loading transparently.
                 { path: '../dist/paper-full.js', namespace: 'paper' }
             ],
-            timeout: 20
+            timeout: 40
         }));
 });