Add ObjectStorage module.
Well I only wanted to implement saving and got carried away.
I cleaned the code up a bit. Everything auto-saves now (every 10s)
except for achievements. Maybe we should look at them together.
Remove duplicated achievements (closes #14)
Add achievements link to navbar
Add achievements local storage support
Add cookie law message
Add UI functionality for saving.
Also fix problems with rounding and the numbers popping up.
Add update notification
Track gameplay time for achievements
Basic analytics support