Installed Django-haystack to installed apps, added connections to whoosh, created required search indexes, updated base.html and updated tests and requirements.

Installed Django-haystack to installed apps, added connections to whoosh, created required search indexes, updated base.html and updated tests and requirements.

Created the search indexes for all models. Added a basic search template required by haystack. Updated the tests for cemetery, marker and person to check get_absolute_urls set up in models. Updated the url template tags to include a link back to search.  Updated base template to include button on navigation bar for search template.  Updated requirements to include whoosh and django-haystack.  Removed and added a new line to views.py.