Fixes azure storage compatibility issue with classifai.

[ShahAaron]

This PR resolves the compatibility issue between ClassifAI and Microsoft Azure Storage.

It would resolve #201 .

Description of the Change

When images are added through the media gallery and Azure Blob Storage is used the images are not correctly smart cropped and the alt tags are not generated. This is due to the smart cropping and tagging happening after the image has been uploaded to Azure. By adjusting the priority of the filters to make sure smart cropping happens before the alt tags are generated it means that the image is smart cropped correctly with alt tags generated before sending the image to Azure.

Benefits

New images are now added and smart cropped correctly before sending to Azure Blob Storage via the plugin https://github.com/10up/windows-azure-storage. All tags were generated correctly and the correct url generated in the media gallery.

Possible Drawbacks

The smart cropping will not work locally as it needs to be from a publicly accessible url. The image will be correctly tagged and upload to Azure but not with the smart cropped image.

Verification Process

This only works on a publicly accessible site.

1. Add Azure Storage plugin. Activate it and go to settings->Microsoft Azure and varify the correct credentials have been added to link to the Azure Blob Container.
2. On the "Image Processing" Classifai settings page, with credentials in place, check the "Enable smart cropping" checkbox and the "Automatically Tag Images" checkbox.
3. Upload an image to the media gallery.
4. Check the image is in Azure Storage
5. Check the image has the correct Azure url in the media gallery
6. Check Image tags have been generated correctly
7. Add the image to a test page and insure all alt tags have been automatically generated correctly for the image

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

[jeffpaul]

Pinging @rickalee in case he's able to help test/validate this PR?