Handle accessors on Node.js Stack Processor

[mmarchini]

For code like this:

class Foo {
   // ...
   get bar() {
   }
}

The Node.js Stack Processor is using get as the function name instead of bar. It should use get bar instead. Since there's no separation between the function name and the file name, and since the file path can have spaces, this will be tricky to handle.

[jasonk000]

fixed in #18