add some feed files for testing
add some more feeds for testing
add 'new', 'title' and 'episode_count' methods

This is the beginning of the public API for Music::Podcatch. We're
using XML::Feed as backend for feed parsing. Many methods of
Music::Podcatch will be thin wrappers around methods from XML::Feed.

- implement 'new'. It takes the feed location as parameter. This is
  passed as is to XML::Feed->parse
- implement 'title' and 'episode_count' as wrappers around XML::Feed
- provide basic tests to see that these work
rename 'episode_count' to 'entry_count'; add docs
workaround an annoying default in XML::Atom
add more tests

- episode count can be less than entries in the feed
- ATOM feeds are parsed as unicode
move test feeds to a test helper package

The test feeds will potentially be used in other test files. They also
clutter the test file. So they are moved to the TestFeeds package that
lives in t/lib.

- introduce TestFeeds
- implement TestFeeds::all_names that returns all names for test feeds
  in alphabetical order
- implement TestFeeds::get($name) that returns the feed parameters and
  an instance of Music::Podcatch initialized with the given test feed
  file
- adjust the 01-parse tests accordingly
Merge branch 'feature/parse-feeds'