fix(script): linux only accepts one argument after shebang, so revert…

… giving app-scripts more memory by default

Linux only accept one argument in a shebang, so everything after the
/usr/bin/env is seen as one argument.

For setting this node option, see
npm/npm#12238

Resolve #838

bin/ionic-app-scripts.js

@@ -1,4 +1,4 @@
-#!/usr/bin/env node --max_old_space_size=2048
+#!/usr/bin/env node
 
 if (process.argv.length > 2) {