removed redundancy from formatting
value_on aDate returns for at least some cases
incorporated navigation menu from Bootstrap
rolled up value dates
corrected annual return calculation
fixed earliest value date in eb page
formatted annual return
corrected return calculation for only valuations
changed display of value date, corrected funding circle cashflow
works with dummy exchange rate
added spec for fx store, and a simple in-memory implementation
FxRate class conforms to Fx Rate Store protocol now
added extra examples for fx store, scaffold for market rate mover
extra example for fx store
exclude base currency from market rates
simple copy from market rates to store ok
removed unnecessary coupling between market rates and database
changed names of specs to new model
extracted fx_rates class
added hash access to fx rates