Merge pull request #4 from MattFaus/master

Add global stats to logged out homepage
updated homepage layout, added more text on non-signed in homepage
api/cron: update stats after order processing
app will not fail if global stats not calculated. Will just show not show them yet.
todo list updted
Add confirmation for orders that will execute immediately.

Without this code, inputting a buy order > 5% of the current price or a sell order < 5% of the current price will execute the order immediately without confirmation.

Test Plan:
Submit relevant orders on /homepage/new-order
See the confirmation dialog pop and not pop correspondingly.