Added Crud operations

[elliott-davis]

Added Crud operations to the socket. I don't know if you want this in the core code. I added it to so this module could work with SailsJS.

[btford]

Please rebase against master. 004ea33 and 4c04c5f are stale.

[btford]

Actually, I think this should be a separate module on top of angular-socket-io. You could do something like:

angular.module('libsysguy.socket-io-crud', [
  'btford.socket-io'
]).
factory('crudSocket', function (socket) {
  var crudSocket = {};

  // add methods to crudSocket using socket

  return crudSocket;
});

This keeps the code modular and doesn't bring in dead code for users of angular-socket-io.

If you think the code is helpful to others, you can put it up on Bower as well.

[btford]

See #33 as well.