Merge pull request #6 from mauriceling/master

1. Added "safe" set of Ragaraja instructions for use in simulations 2. Amended simulation 06 to use os.sep for OS friendly file path
Included ecosystem dictionary in the initialization of World class
Removed simulation result files from ignore list
Added methods to revive a frozen population along with an excavated world
New write_rev_parameters to write parameters in a revived simulation
New freeze and revive methods that dumps the object itself, instead of a specific component
Updated 06_revive_simulation_01.py
Initial commit of 01_basic_functions_one_cell_deployment.py results for the testing of 06_revive_simulation_01.py
Merge pull request #45 from clarencecastillo/master

Updated dose.py to support revival of frozen populations/buried worlds