refactored interest calculation into seperate class - now uses different approach
There are differences in interest for changing rates. But quite certain no bug but due to different calculations.
added pretty-printed option to interest calculation for easier debugging
fixed failing tests due to refactorings
added ContractTerminator to terminate easily end contracts
contract termination added - still a few weird bugs (termination only works for date.current)
improved cuke steps and added step for date-select stuff
updated to most recent rails 3
added concerns autoload (remove as soon as rails 4 update)
refactored ContractTerminator into single responsibility models (+bug hunt)
added cukes for new contract termination feature ad a few improvements (accounting entries ordering)