Add htmlAttributes attribute to allow developer to pass any html attribute to rendered img

[frederickfogerty]

Before you submit:

• Please search through the existing issues (both open AND closed) to see if your feature has already been discussed. Github issue search can be used for this: https://github.com/imgix/ember-cli-imgix/issues?utf8=%E2%9C%93&q=is%3Aissue
• Please take a moment to find out whether your idea fits with the scope and aims of the project

Is your feature request related to a problem? Please describe.
Right now as a developer I am limited to passing the attributes that are specified by this library. This causes PRs such as #54 to be necessary to add support for HTML attributes. Instead, it would be better if we could allow the developer to pass any HTML attribute.

Describe the solution you'd like

{{imgix-image
    path='/assets/something/user.png'
    htmlAttributes=(hash
      alt="Alt text"
    )
}}

[Duder-onomy]

Good News! The Ember slack delivered.
If we use this, https://github.com/rwjblue/ember-angle-bracket-invocation-polyfill, which is basically the future of ember templates polyfilled.
We can do things like:

Supports passing attributes to be added to the root element of the component without @ prefix
<FooBar data-test-foo-bar></FooBar>

In which case, we can leave all the htmlAttributes out of the components attributeBindings and put all that back on the invoker.

The angle bracket invocation is still a polyfill, but it is only a matter of time now: as this pr emberjs/rfcs#311 has been merged.

[frederickfogerty]

Interesting @Duder-onomy. Thanks for following up! As an aside, do you ever see them moving to JSX (this looks awfully a lot like JSX already)?

[frederickfogerty]

For the polyfill, is it something that a consumer of ember-cli-imgix has to include, or is it something we can include at a library level?

[sherwinski]

Closing as this issue is quite old - but we're happy to reopen if there is still a need for this at some point in the future.