Added TurnType, calculations to NetworkFactory.
Refactored Network to use generics and put attributes as fields in node,
edge, and traversal objects.  Created new package
org.sandag.abm.active.sandag to hold SANDAG-specific code.  Created
properties file in src/test/resources.  Wrote test
SandagBikeNetworkFactoryTest for SandagBikeNetworkFactory.