create barcodes for existing kits

[ayobi]

Taking from task description, this PR covers part 1:

Add a barcode to an existing kit (new feature). In this scenario, there already exists a kit in the database with one or more barcodes. The user will log into microsetta-admin and add barcodes to one or more kits, and it needs to provide the following options:

• Add barcodes to a single kit. The user would enter a Kit ID into a text field, then have the option to either enter a barcode to add to the kit OR dynamically generate a new barcode to add to the kit (using the existing barcode generation function). If it's a generated barcode, the output should inform the user of the newly created barcode. Otherwise, the output should be a success/failure message.

• Add barcodes to several kits. The user would upload a CSV file with Kit IDs in the first column. They would then have the option to either add a dynamically generated barcode to each kit OR put a barcode in the second column of the CSV file. In either case, the tool should return a CSV file with the Kit IDs and the newly added barcodes.

[ayobi]

Added part 2:

The user can now provide their own barcode(s) if needed when they're creating a kit. This can be done either by providing the barcode(s) in the field(s) OR they can upload a list of barcodes via a csv file.

[cassidysymons]

@ayobi Can you please take a look at the conflict on this PR? I think you'll need to merge biocore:master into your branch to pick up new changes, and then possibly re-adjust the conflicting function. Thanks.