Added default engine in configuration

[5.2] Make Memcached options configurable.

.env.example - Changed localhost to 127.0.0.1

Fix title heading level in readme.md

Handle authorization header

[5.2] Don't return a login page to a JSON request

Currently, any unauthorized API requests that pass through the `auth` middleware get a redirect to the login page. Adding the `wantsJson` flag to the conditional corrects this behavior.

Fix tab to spaces in web.config

Change redirecTo in AuthController

Disable demonstration command

If the purpose of the command is to demonstrate, does not become nescessário leave it enabled by default.

[5.2] Remove unused import

Typo in docs

Should be _separate_ not _seperate_ :)

Applied fixes from StyleCI