Added random sampling .json database files

Added random sampling to Acrostic.generate_random_acrostic() method,
also added a few .json files to attempt to build databases from flat
text files.

these files were created according to guidelines described in
https://docs.djangoproject.com/en/dev/howto/initial-data/

generated a word-free .json file for initial data:
python manage.py dumpdata --indent=4 > ../resources/initial_data.json

after adding entries in Inital_Words to the initial data file, initial
data file like this:
python manage.py loaddata ../resources/initial_data.json