Revert ember modules API for debug helpers

[simonihmig]

This reverts the latest changes here, because of this weird issue: emberjs/ember-cli-babel#184

After updating to latest release in ember-bootstrap, I was getting this syntax error in IE11 because of the failed transpilation: https://travis-ci.org/kaliber5/ember-bootstrap/jobs/289844974#L621

[simonihmig]

For the record, this was the transpiled output before my changes:

define('ember-popper/-debug/helpers', ['exports'], function (exports) {
  'use strict';

  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.debug = debug;
  exports.debugOnError = debugOnError;
  exports.assert = assert;
  exports.warn = warn;
  exports.deprecate = deprecate;
  exports.stripInProduction = stripInProduction;
  var emberDeprecate = Ember.deprecate;
  var Logger = Ember.Logger;
  function debug() {
    Logger.debug.apply(Logger, arguments);
  }

  function debugOnError(msg, conditional) {
    if (!conditional) {
      console.error(msg); // eslint-disable-line no-console
      debugger; // eslint-disable-line no-debugger
    }
  }

  function assert(msg, conditional) {
    if (!conditional) {
      throw new Error(msg);
    }
  }

  function warn() {
    (true && Ember.emberWarn(...arguments));
  }

  function deprecate() {
    emberDeprecate.apply(undefined, arguments);
  }

  function stripInProduction(cb) {
    cb();
  }
});

[pzuraq]

We likely need to remove those custom debug helpers altogether, they’ve been replaced by the ember ones

[pzuraq]

Yeah, so @simonihmig everywhere that we use those debug functions should be directly replaced with the appropriate import from @ember/debug, they are all automatically stripped now. The babel transform included with this addon should be removed as well.

I'd definitely prefer rolling forward rather than reverting the change, I'll be able to address it soon but I've got other things on my plate at the moment. Think you can take it on?

[simonihmig]

Think you can take it on?

I will give this a try now!

[simonihmig]

Closing in favor of #50