accounts: begin tracking signup and signin dates, work on information generation

![pagination style month selector](http://i.imgur.com/761HJqx.png)

I recently discovered that some numbers were being messed up in the past account page, that is fixed - and now it narrows searches down to the month of your selection instead of the last thirty days.

Schema update for signon and signin dates:

```sql
ALTER TABLE user ADD signup_time INTEGER;
ALTER TABLE user ADD signin_time INTEGER;
```