Group similar upgrade task.

Signed-off-by: crynobone <crynobone@gmail.com>
Added instruction to update composer.json to 4.1
Adding failed queue job options.
Merge pull request #2446 from seengee/develop

Added instruction to update composer.json to 4.1
Tweak comment.
Update upgrad guide.
Merge pull request #2440 from crynobone/patch/upgrade

Group similar upgrade task.
Added step to add remote.php
Merge pull request #2453 from bretterer/patch-1

Added step to add remote.php
Added step to add new failed queue job option to queue.php
Missing instruction for `secure` option to be added to session config file
Step to update `view` config file to switch to bootstrap 3 pagination
Added step to turn off redis clustering by default in `database`
Merge pull request #2455 from irazasyed/patch-1

Added new steps - upgrade.md
Re-order upgrade instructions

composer update throws an error while executing artisan if you have not yet done this step:

- Remove call to `redirectIfTrailingSlash` in `bootstrap/start.php` file.
Merge pull request #2470 from adamgoose/develop

Re-order upgrade instructions
Enhancements to the 4.0>4.1 upgrade guide.
Merge pull request #2471 from adamgoose/develop

Enhancements to the 4.0>4.1 upgrade guide.
Mention redis connection.
Corrected the spelling of 'maintenance' in comment block