adding module level docstrings across all models
Merge branch 'jon' into sprint15
Merge branch 'jon' into sprint15
Merge branch 'jon' into sprint15

Conflicts:
	models/agdrift/agdrift_parameters.py
	models/agdrift_therps/agdrift_therps_parameters.py
	models/agdrift_trex/agdrift_trex_parameters.py
	models/exams/exams_parameters.py
	models/kabam/kabam_input.py
	models/kabam/kabam_parameters.py
	models/pfam/pfam_input.py
	models/pfam/pfam_parameters.py
	models/przm/przm_parameters.py
	models/przm5/przm5_parameters.py
	models/przm_exams/przm_exams_parameters.py
	models/sip/sip_parameters.py
	models/trex2/trex2_parameters.py