General rewording/relinking 

Documentation right now really differs from English to Spanish. I'll try to update as much as I can.
Merge pull request #1641 from ricardovegas/patch-1

General rewording/relinking
Update components.rst

Including a param for Controller throws a warning that no second argument is passed. I assume you are now supposed to `$event->getSubject()` instead of being passed a controller, or use `getController()` from the constructors collection.
"previous", "next" links are in reverse order than usual. #1428
If installed through composer no need to perform some manual steps
Merge pull request #1643 from davidyell/patch-6

3.0 Update components.rst
Merge pull request #1645 from mar3k/3.0-1428

"previous", "next" links are in reverse order than usual. #1428
Merge pull request #1647 from spiliot/3.0-tutorial-blog

If installed through composer no need to perform some manual steps
Update how to set the page title.

cakephp/cakephp#4370 pointed out that the documentation was confusing
and totally unclear. I hope this clarifies this.
Merge pull request #1648 from cakephp/title-update

Update how to set the page title.
Adds filename. :construction: need to check path
adds filename to plugin loading example
Update components.rst
Merge pull request #1649 from alecho/patch-3

Adds filename. :construction: need to check path
Merge pull request #1651 from davidyell/patch-7

3.0 Update components.rst
remove exception.rst
Updated spanish translations

Added notes on every non-translated doc page (Spanish translations)

Removed old `advanced-installation.rst` + unnecessary `empty` file

Added full English copies for currently non-existent Spanish translations

Added files from root folder missing on commit fc277d611370c096deefa6d3e7929b4088bf7d6d

Updated es/contents.rst according to current version
Merge remote-tracking branch 'docs/3.0' into spanish-translation-notes

Conflicts:
	es/index.rst
General rewording/relinking of Installation in ES

Now it looks exactly like the one in english.
fixing title of installation