caltechlibrary/dibs: Version 0.2.0

* The `/stats` page now has shows symbols to indicate recent page retrieval activity, to help gauge how active a given item currently is. * End times and reloan times are now rounded to whole minutes. This is to help avoid confusing situations where loans seem to go past their allotted times. * A small new program, `query-dibs`, is available at the top level to query the database from the command line. Currently it has only limited functionality but this will undoubtedly grow over time.