error stack should properly handle newlines

[redchair123]

If you make a typo (or elicit some other error), the text is rendered with "\n":

"SyntaxError: Unexpected identifier\n at new SandBox (/home/server/node-host/sandbox/index.js:66:9)\n at builder.back (/home/server/node-host/test.js:48:17)\n at builder.count (/home/server/node-host/sandbox/build.js:139:7)\n at done (/home/server/node-host/sandbox/build.js:24:7)\n at builder.compiler (/home/server/node-host/sandbox/build.js:62:2)\n at new builder (/home/server/node-host/sandbox/build.js:13:10)\n at Object. (/home/server/node-host/sandbox/build.js:143:13)\n at Object.build (/home/server/node-host/sandbox/index.js:111:37)\n at IncomingMessage. (/home/server/node-host/test.js:35:14)\n at IncomingMessage.emit (events.js:61:17)"

Those "\n" should be replaced with a proper newline character or a