Uploading a CSV file is processed as it is uploaded

[puck]

Currently if a user uploads a CSV file it is processed as part of the HTTP request For even a vaguely large file this can take a while and leaves the user perplexed about what is happening.

What would be better is to store the CSV file, then have a worker process to handle parsing the CSV file. It could keep state somewhere about far through it is to be displayed in a web page.