Adds path to aid new users
Fixes obsolete CakeLog class reference

Signed-off-by: Mark Story <mark@mark-story.com>
Merge pull request #2163 from bravo-kernel/monolog-example

Adds path to aid new users
[fr] #2150, #2153, 3b1756f6, #2160, 19bbce7c

note for @cake17 I first added most of it in english, will translate when I get time, and also it's easier to review
Explicitly specify path for FileLog config.

FileLog doesn't set the path as default anymore using LOGS constant internally.
Complements monolog example
Clarifies reason
Clarifies reason
Merge pull request #2164 from bravo-kernel/monolog-example

Complements Monolog example