Scheduler updates, working scheduler_tutorial.ipynb

- commented out the Xap variable lines
- added a bunch of self variables to save constraint rows
- constraint 2 is now in an if statement in case there are not any dependencies specified
- commenting out constraint 12
- using the minimum weather maximum of the asset group to set the weather constraints

- some updates to the schedulerREADME from new task-asset group matrix defining

- full working scheduler_tutorial that is all up to speed and produces the right outputs

Author: shousner