Finish sorno_appcache_generator

Summary:
sorno_appcache_generator.py is a working script now.

Fix the she-bang line of several scripts including the template. Use
RawDescriptionFormatter for parser as well, so the description can be
formatted manually in a better way.

Add some .gitignore rules to exclude annoying stuff

Make setup.py automatically includes all scripts under the scripts folder.

Test Plan:
sudo python setup.py install

Test it with PersonalFinancialCalculators: sorno_appcache_generator.py PersonalFinancialCalculators/personal_financial_calculators > PersonalFinancialCalculators/personal_financial_calculators/personal_financial_calculators.appcache