Rewrite UI "progress box" code with JQuery

Add form validation, slightly improve form styles.
Draft implementation of generating unique upload ID

Generates a unique ID by hashing the upload filename, timestamp, and a random
salt. Returns this value to the user along with the upload confirmation
message.
Add CSS reset
Notes about upload uid's and secure deletion
Nicer styles for flashed messages
Merge html and css from old upload page (incomplete)

Since I want to use the CSS reset, I need to re-do the form styles which is
somewhat tricky. I have added rules to restore most of the original look,
except for the form labels and inputs. I need a CSS reference to finish this,
and don't have Internet access ATM.
Merge intial notes on worker design

Possible ways to design the worker handler to address data remnance concerns.
We pretty much want to keep sensitive data out of long-running Python
processes, since we can't know how long it might remain in RAM.
Thoughts on replacing/still using the beanstalk queue