No way to get stack trace from javascript TypeError or ReferenceError

```
Run something like the following:

import PyV8
c = PyV8.JSContext()
c.enter()
c.eval("function f(){foo = null; foo.bar();};")
c.eval("f()")

The resulting exception shows the line of the error, but there appears to be no
way to get the full stack trace (like there would be if the code was something
like 'throw Error()')

```

Original issue reported on code.google.com by `russell....@gmail.com` on 4 Jun 2013 at 12:29

Reproduce the behavior through PyV8.JSContext and c.eval using the JavaScript TypeError example in the issue. Start by tracing how exceptions from evaluated JavaScript are exposed, and consider the work complete when a TypeError or ReferenceError provides its full JavaScript stack trace rather than only the error line.

Written by the indexing model from the issue text.