Add logging capability (#175)

* Refactoring and addition of logzero (#172)

* Refactored convert.py and added logging.

* Added logging and refactored.

* Added logzero to requirements.txt

* Added logging to metadata.py

* Created a log in misc.py. Updated slugify import.

* Some general improvement

* Improve message layout

* Improve test mechanism

* Implement debug level logging

* Fix some minor mistakes

* Make pytest happy

* Remove unimplemented --verbose option

* Update ISSUE_TEMPLATE.md

* Rename LICENSE

* Remove obvious from log.debug()

* Show track URL when writing to file (debug)

test/test_username.py

@@ -33,8 +33,7 @@ def test_tracks():
                 try:
                     fout.write(track['external_urls']['spotify'] + '\n')
                 except KeyError:
-                    title = track['name'] + ' by '+ track['artists'][0]['name']
-                    print('Skipping track ' + title + ' (local only?)')
+                    pass
             # 1 page = 50 results
             # check if there are more pages
             if tracks['next']:
@@ -45,7 +44,7 @@ def test_tracks():
     with open('list.txt', 'r') as listed:
         expect_song = (listed.read()).splitlines()[0]
 
-    spotdl.misc.trim_song('list.txt')
+    spotdl.internals.trim_song('list.txt')
     with open('list.txt', 'a') as myfile:
         myfile.write(expect_song)