Converted/restructured the django project into django application.
Added all the necessary files to package the app using setuptools.
Put the hazard_calculator app in the 'src' folder.
Changed the documentation a bit to reflect these changes.

--HG--
rename : __init__.py => src/__init__.py
rename : hazard_calculator/__init__.py => src/hazard_calculator/__init__.py
rename : hazard_calculator/hazards.py => src/hazard_calculator/hazards.py
rename : hazard_calculator/management/__init__.py => src/hazard_calculator/management/__init__.py
rename : hazard_calculator/management/commands/__init__.py => src/hazard_calculator/management/commands/__init__.py
rename : hazard_calculator/management/commands/import_hazards.py => src/hazard_calculator/management/commands/import_hazards.py
rename : hazard_calculator/models.py => src/hazard_calculator/models.py
rename : hazard_calculator/mylogger.py => src/hazard_calculator/mylogger.py
rename : hazard_calculator/tasks.py => src/hazard_calculator/tasks.py
rename : hazard_calculator/tests.py => src/hazard_calculator/tests.py
rename : hazard_calculator/utils.py => src/hazard_calculator/utils.py
rename : hazard_calculator/views.py => src/hazard_calculator/views.py
rename : manage.py => src/manage.py
rename : settings.py => src/settings.py
rename : urls.py => src/urls.py