Native s3 sync (#23)

* Native S3 sync implementation

* fix imports

* fix paths reading

* install s3 components duriing test stage

tests/testresources/core/ahriman.ini

@@ -48,8 +48,10 @@ command = rsync --archive --verbose --compress --partial --delete
 remote =
 
 [s3]
-bucket =
-command = aws s3 sync --quiet --delete
+access_key =
+bucket = bucket
+region = eu-central-1
+secret_key =
 
 [web]
 host = 0.0.0.0