Made clean target nicer.
Companies are not going to be removed from the Stock Exchange.
Stubbed out a function as the beginnings addressing issue #18.
Companies are not going to be removed from the Stock Exchange.
Update available company names when mergers occur.

This should address issue #26.
Added missing parens.
Added player cash data and functions.

This should address issue #24.
Updated dividend percentage amount to apply in-game.
Added the ability to get all share values.
Added function call for getting player dividends.

Currently a pass-through.
Added functions for dividend calculations and payment.

Also updated display function to show cash-on-hand.
Added the ability to get player shares for all companies.
Removed unused require.
Added tests for divident-related stuff.
Added basic bank code.
Additional work in support of adding the 'bank' feature:
* removed play cash code
* added finance code for performing operations on bank data
Updated game initialization to create a bank.
Moved star map data out of fake game data.
Updated game to start tracking player cash.
Added a ticker command and make supporting changes.