Rewritten classes and tests to use ActiveRecord persistence.
Updated README
Added Transactions, with Credits and Debits subclassed.
Correctly set :assets as an attribute on Bank class, with initial 1000.00
value.

Account#balance now totals from Transactions.

Bank#liabilities now totals from Accounts#balances.
Very basic command parsing and output in place to output class lists.
Added Yard documentation.
Finished building gemspec.
Updated README.
Build ruby_bank-0.0.0.gem for local installation.
Added gem file to version control.