The fulfill script generate auction-based scenarios.

Several auction-related parameters are added to the 'fulfill' script, which generates scenarios to be simulated.

It can be specified:
 - The minimum and maxium prices the can be associated to a level.
 - The schedule with roles that are adopted by each ASBox during the simulation.
Bug fixed: Added methods to the UserPreferences.

Added methods for setting and getting the prices associated to each level. The last commit lacks implementation of these methods.
Added GLM containing schedules for the auction-related simulations.
Modified 'gitignore' in order to discard temporal resources.