Addition of Application and Analysis Guide

[JoeJimFlood]

This pull request adds the first iteration of the ActivitySim Application and Analysis guide. It includes guides on how to perform three scenarios that are under the existing user guide:

• Land Use Change: The addition of a transit-oriented development along a light rail line
• Network Change: The addition of a BRT line
• Telecommute Change: A return to the office scenario

[guyrousseau]

Thanks @JoeJimFlood, job well done. Following up on what I sent you earlier this week in reference to this TOD scenario:

• How are the (increased) willingness and propensity to ride transit reflected in this TOD scenario, from a travel behavior sensitivity perspective? Perhaps in the utility expression calculations? In tour mode choice and trip mode choice utility functions?
• How does this TOD scenario determine the impact of TOD on Single-Occupant Vehicle trips, in terms of significance?