Update gem to pass with v2.8

[fastjames]

Update the gem to pass under Solidus v2.8. This should provide a good starting point for further updates to support Solidus v2.9 and beyond. Changes made include:

1. Update TravisCI matrix to remove EOL Solidus versions
2. Update Rakefile to support standard rake task
3. Pin sprockets to <4 to avoid new breaking change
4. Add puma dev dependency for feature specs
5. Update factory to remove static attribute
6. Update reference to capybara wait time
7. Update feature spec to match option text and ordering as observed

[dhonig]

Tests are still failing. Let us know if you need a hand with this.

[fastjames]

Tests are still failing. Let us know if you need a hand with this.

Thanks for the heads-up. I took a look at some other extensions and updated the travis config to be more like those (since they are passing).

[fastjames]

@dhonig some progress -- the only two failing paths now are v2.5 and master.

[fastjames]

It looks like master is failing because the add_class method was removed back in July: https://github.com/solidusio/solidus/commit/d82fb569ab2f4d79181473c35169813ab7c39e35

[fastjames]

The v2.5 path is failing because it times out while running bundle.

[fastjames]

I just pushed a commit that passes locally for master. I didn't test it with other versions yet. Still no idea what's up with v2.5.

[fastjames]

Sorry this has taken so long -- I have not had much luck replicating these CI failures locally. Hopefully moving to selenium and headless chrome will help some of these since they seem to be possible browser-related.

[fastjames]

Let the record show that I have now gotten every branch to pass at least once, just not all on the same run. :rofl:

[fastjames]

I think I have taken too big of a bite here, so I'm going to close this PR and retrench on a more focused branch.

[fastjames]

Continued in https://github.com/boomerdigital/solidus_flexi_variants/pull/22