Adds sample data to data_structure.
Adds failing test to unit tests, a function that creates a mongo query out of combined index cursors.
Cleans up doc strings.
Makes new test pass.
Rewrites build_mongo_pages_query to account for multi-row cursor inputs.
Adds an assertion for the word hits on pages item.
Adds a helper function to remove duplicate dictionaries from a list.
Makes tests pass.
Uncomments check on hits in test for building pages query with two words and fails test.
Cleans up remove_duplicate_dictionaries.
Adds helper function remove_duplicate_numbers to remove duplicate numbers from lists of numbers.
Completes functionality to pass test for building a mongo pages query from a two word search.