Fix regression: filter should give exclude precedence. (#23)

Fix issue when two filter "excludes" have the same string length (#22)

Add filtering option for add_database (#19)

Add ability for the cache to filter types based on a predicate (#18)

Add the ability to load a new database file into an existing cache (#16)

* Add the ability to load a new database file into an existing cache

* Add comment about add_database possibly invalidating iterators in namespace_members

Update README.md

Enable native project use (#5)