Portfolio "tracking"

[chrislennon]

Add an optional 'point in time' selection to the web-app and create static outputs of price for that specified time.

To investigate:

• API source for one time or continual (but why?!) checking of the historic price.
• How to layout the elements:
  • Single element, append datetime. i.e. $1000 - 29/12/2017 00:00
  • Grouped element, show datetime as group name.

suggestion source: reddit

[chrislennon]

f251eb9 makes a start on what is required for historical based pricing.

Still TODO:

• UI for date/time picking
• Populating the correct API call with the datetime selected
• Parsing the response from API for the correct datetime selected
• Modifying (and forcing?) grouping functionality to show datetime selected

[chrislennon]

caae9bf implements:

• UI for picking
• population of API call and response
• Forcing grouping

Probably need to think about styling and timezones (urgh -.-)