added setting to skip migrations for tests. added check to delete_all_outputs to not remove workspace folder if no scenario folder exists. changed file location in test_population_link so it passes.
changed name of variable in delete_all_outputs to be more descriptive. updated gitignore with cache directory from build results.
Merge branch 'master' into fix-python-tests
added tests to indicate what should happen when a new Population is created with an invalid source file. Refs #189
added tests for PopulationParser. fixed class to allow a utf16 file to be parsed. Refs #201.
created tests module for ScenarioCreator. moved test related fixtures into module.
Merge branch 'master' into python-tests
added tests for probability at form level. fixed issue with modal not properly displaying a validation error when saving. Refs #190.
added test to verify modal closes when probability functions are edited and saved. fixed bug where edit view was not returning proper information for ajax requests. Fixes #195
Merge remote-tracking branch 'origin/python-tests'

Conflicts:
	SpreadModel/settings.py