Add support for folder base journal.

Adds feature for issue #170 (and #398) where you configure your journal to
be a directory and entries are added as sub-directories and files:
yyyy/mm/dd.txt. Multiple entries in a day will go in the same file, but a
new entry for a specific day will create a new file (and directory
structure).

Fix failed test scenarios for folder journal.

features/steps/core.py

@@ -269,6 +269,15 @@ def check_journal_entries(context, number, journal_name="default"):
     journal = open_journal(journal_name)
     assert len(journal.entries) == number
 
+@when('the journal directory is listed')
+def list_journal_directory(context, journal="default"):
+    files=[]
+    with open(install.CONFIG_FILE_PATH) as config_file:
+        config = yaml.load(config_file, Loader=yaml.FullLoader)
+    journal_path = config['journals'][journal]
+    for root, dirnames, f in os.walk(journal_path):
+        for file in f: 
+            print(os.path.join(root,file))
 
 @then("fail")
 def debug_fail(context):