Create web-based interface for batch upload.

[dolsysmith]

A proposed enhancement building on #10.

• batch_loader.py captures STDOUT from the Rake tasks and populates a CSV with success/error flags, as well as the object ID's for successfully created objects.
• If feasible, batch_loader.py also captures and records, in said CSV, the object's persistent link in GWSS.
• A simple web server with some bare-bones HTML allows the user to upload a bunch of files from their workstation, including a CSV or spreadsheet with the metadata.
• Client- or server-side JS performs some basic data validation on the metadata (e.g., are required fields missing? Do file names match uploaded files?)
• The server script puts the CSV and files in the appropriate directory and runs batch-loader.py on the CSV and files.
• The output CSV is made available for download from another HTML page.

This would support a more distributed workflow by GWLAI staff, avoiding bottlenecks in the use of the batch-loader.

[kerchner]

Maker sure to evaluate other options recently developed to work with Hyrax, before proceeding with this work