Project logging

[jodosha]

This PR introduces project level logging (Hanami.logger), automatic logging for HTTP requests, SQL queries, and migrations. It removes application level logging (Web.logger).

Example of logging with the default formatter (development):

[bookshelf] [INFO] [2017-01-31 18:23:12 +0100] (0.000389s) SELECT "id", "name" FROM "books" WHERE ("books"."id" = '1') ORDER BY "books"."id"
[bookshelf] [INFO] [2017-01-31 18:23:12 +0100] HTTP/1.1 GET 200 127.0.0.1 /books/1  451 0.018351

Example of logging with the JSON formatter (production):

{"app":"bookshelf","severity":"INFO","time":"2017-01-31T17:25:42Z","message":"(0.000389s) SELECT \"id\", \"name\" FROM \"books\" WHERE (\"books\".\"id\" = '1') ORDER BY \"books\".\"id\""}
{"app":"bookshelf","severity":"INFO","time":"2017-01-31T17:25:42Z","http":"HTTP/1.1","verb":"GET","status":"200","ip":"127.0.0.1","path":"/books/1","query":"","length":"451","elapsed":0.017913}

---

Closes #484

/cc @hanami/issues @hanami/ecosystem for review 👍

[davydovanton]

great work 👏

[davydovanton]

@jodosha just a question: what do you think, will we have some problems with logger after switching from 0.9 to 1.0?

[jodosha]

@davydovanton Which kind of problems?

[AlfonsoUceda]

LGTM @jodosha