Modify Generator Methods to Also Return Dictionaries

[zembrodt]

Modify certain generator methods, potentially for both PyMDbParser and PyMDbScraper, that return a dictionary of objects rather than a generator. Example would be get_full_credits returning a dictionary where each key is a unique job title and the values are an array of Credit objects.

[zembrodt]

Somewhat of an overhaul of every method in both the parser and scraper, should be left for a 0.X.0 update.

[zembrodt]

This should actually be only done for scraper methods as even the largest titles won't return an extremely large list/dictionary to hold in memory. The parser however parses objects from every title/person stored by IMDb so this would be inefficient to completely store in memory.