Added code to split gif, jpg, and png extensions
Changed project version to 0.0.2-SNAPSHOT
Paths used for db are now in linux path format

Using slash instead of backslash, as this works on windows as well as linux.
Replaced hardcoded directory separators with Path
Removed loading external JDBC ar
Fixed NPE for loading oldest filter with empty table
Fixed NPE with getting non-existent filters

Filters that do not exist will now default to an "unknown" state.
Added tests to avoid regression

closes #13