Working Backtest Framework

[JakeVestal]

Function that can go back through time and, given criteria:

1. Generate a limit order to ENTER a position overnight
2. Generate the limit order to CLOSE the position
3. Generate the market order to CLOSE the position if not closed after x days
4. Assume allocation amounts (maybe keep a constant for now, informed by Phoebe)
5. Tracks all this (cash out, cash in, etc)
6. Basic plotting (e.g., cash over time)

[luke-truitt]

1. Created buy order on Open (no limit) based on incoming signal from model
2. Limit order to sell when above threshold t
3. Closes after d days if it hasn't hit the limit
4. Takes in the allocations as a function
5. Tracks portfolio value over time (minor bugs still working out)
6. Tracks all trades to be able to plot value etc.