Release Name: 0.1.3

Notes: Upgrading to this version is recommended, as it provides several bug-fixes and feature enhancements. This version introduces the concept of podcast download strategies: older podcasts may now be ignored even if they have not been downloaded before ("new" strategy); the implicit strategy used in previous versions is now named "back_catalog", meaning that podcatcher is allowed to sift through the back-catalog of unlistened podcasts in feeds. The default strategy is "new" (unlike previous versions).