Quick attempt at an optimal portfolio balancer.

Note that it is not currently optimal (Work in progress)

## To run:
```
yarn
cat test - | node .
```

## Commands:
`
<TICKER>:<price>
`
Sets the stock price for the given ticker

example:
```
AAPL:152.3
```

`
rebalance:<account_id>
`
Triggers a rebalance for the given account ID

example:
```
rebalance:1
```
note: Account 1 is there by default.