Add a query class for years with support for ranges.
Add error message and test for invalid years.
Well, really add it...
Merge branch 'master' of git://github.com/sampsyo/beets
Merge pull request #261 from mschuerig/master

Support for year queries with ranges
generalize YearQuery to NumericQuery
add tests for matching floating-point ranges
Preliminary support for "date added" fields

This isn't yet finished, it needs some input on how to organize the data, and actually where to implement the use of this data, but it already works in setting the date
Using time.time() to store the import time
Formatting the import time in the view and paths

Added the %format{} template function to output the time to any format supported by time.strftime()
Support for date time fields

Added a method to display correctly the field being changed. Besides date/time, it also affects boolean values displaying correctly