Changed cash to a per/tick summation
Force requirements for clickable/collectables
Updated style slightly
Reordered layout of sections on page
Further balancing work
Value tweaks to some types
Added tidal power and power pack types
Tickers don't need to handle onTick themselves

Added a market fluctuation agent that will occasionally make prices really high or
really low
updated 'updates' page
Merge branch 'master' into gh-pages