Make lst even more useful

[herzi]

The branch of Kami contains several useful improvements, I'd like to depend on:

• better handling of caught exceptions
• make sure addListener() does not leak memory

[tlrobinson]

Hmm I don't see how any of these patches fix anything.

5447015 Removes browser support

fed74a2 What's the point of adding an index file? package.json references lib/long-stack-trace.js so it works fine in Node. I'd be fine moving it out of the lib folder though.

e197a41 This removes a feature (LST.rethrow) and adds two lines of code that do nothing:

• console.error("Uncaught " + e.stack);
• if (LST.rethrow)
• throw ""; // TODO: throw the original error, or undefined?
• var stack = e.stack;
• e.stack = stack;
• throw e;

3d5019a: I'm not sure what the purpose of this is. You're saving the original function but never restore it.