Feature to add

[syaau]

• Eviction Policy
  Clients are not supposed to keep an entire database but just a part of it. Besides JS is single threaded, if we start building index for a huge database or perform a sort operation, it will block the entire UI thread. For these reasons, each scheme on a redux database should have limited number of records. A eviction policy method should perform this operation where the eviction may be based on various factors.
• Aggregation
  Along with the database index, an aggregation method could be supplied that would calculate the aggregated values like (sum, count, etc).
• Sorting
  The data should have a sort field, which makes keeps the allIds list sorted by this field.
• Add helper methods (dispatch actions) to perform certain actions like rebuilding index, sorting dataset, etc.
• Add data structure. [Reminder to self, this is partly implemented in HoneyGuide next repo]