fix array helper clobbering built in helper

[kturney]

The version of ember-composable-helpers currently being used provides an array helper.
ember@next has started erroring when it encounters built in helpers being clobbered.

ember-composable-helpers@3 has removed the array helper and upgraded to octane.
As an alternative to the commit, we could try to get a new version of ember-composable-helpers@2 cut that excludes the array helper for ember <= 3.8.

[kturney]

Additionally, I made an attempt at tracking down the timeout in test component page index works.
For some reason the click on the 'Internal' toggle is causing both the internal toggle and the private toggle to be checked (but also weirdly doesn't trigger a change event on the private checkbox.).
So when the 'private' toggle is clicked the checkbox is set to checked=false, so when we update in x-component the value doesn't actually change (setPrivate already equals false and is set to false).
If an additional private toggle click is placed after the existing private toggle click, the test passes.

[aklkv]

Any update on this!

[RobbieTheWagner]

@kturney can you please rebase this off of master? Need to see if we can get Travis to run.

[kturney]

Hi @rwwagner90, I've rebased this PR on master.

I've also rebased #451 and #450 if you have any time to look at those.

[RobbieTheWagner]

@kturney thanks! Looks like we have the issue with Ember and Babel now. I know that's fixed in latest Ember releases, but might take a bit to get Travis totally fixed here.

[RobbieTheWagner]

It's currently impossible to get tests running without this, so going to go ahead and merge.

[ming-codes]

Can we cut a release for this?

[RobbieTheWagner]

@ming-codes not until we get a passing build of the addon.