Log segfaults in native modules.

When native code crashes, we don't get any kind of stack trace to help
us debug. At least dump a stack trace now.

Note: this uses a specific git commit of node-segfault-handler because
the released version does not work correctly with node 0.10.x.
Load the segfault handler in erizoJSController.

Now that erizoJSController loads the native addon, the segfault handler
should be loaded here.
Merge pull request #191 from byronclark/segfault-handler

Log segfaults in native modules.