Configurable log collection

• Implemented CSV log handler
• Implemented in-memory log handler
• Removed large log example
• Added example with in-memory log handler
• Removed ETAs from Itinerary
• Added dispatch method to Dispatcher

Release version 0.2.3

Fixes:

• Implement a fixed size cache for routes
• Fix booking_service memory issue
• Fix vehicle state updates issue (change from moving to idling to moving on each time step)