adding demo and more read_networkplan refactoring [tests broken]
Removed polymorphic/generic read_networkplan (read and create are now distinct functions)
1st draft of merging scenarios for sequencing
Completed merge example, make networkplan directed if not in sequence_plan_far
function for spatial dataframes and update tests
Added Example (Rmd), plus some cleanup
Merge pull request #47 from SEL-Columbia/examples

Examples