Updates for PSR-4
Merge pull request #1017 from ADmad/3.0-psr4

Updates for PSR-4
Updates to CakePHP installation, remove Composer installation from Advanced
Remove reference to PEAR package
Update plugin docs for new ORM and other changes.

Update the docs to reflect changes in the ORM. Clean up formatting and
a few other small issues. requestAction doesn't have the same
limitations as it used to have.
Add example of how TableRegistry should work with plugin tables.
Remove advanced installation docs, move sharing CakePHP to installation
[fr] translate folder /appendices

follow en docs
[fr] follow en translation of views.rst

remove media-view in toctree
Merge pull request #1022 from bcrowe/3.0-installation

3.0 - Updates to CakePHP installation, remove Composer installation from Advanced
Fix up docs based on review feedback.
Fix dash.
Add 'Improve this Doc' button for 3.0
Fix a couple things in sharing CakePHP
[fr] update docs for 3.0

folder /cakephp-overview
[fr] Follow 810e398eeea0d540196e42721290f11d6d7e2a8e

Remove docs for code that no longer exists.
[fr] Follow 2742af942177ffbdb8f6576e863efc297c830f20

Remove examples and tutorials from the TOC
[fr] Follow 06abe88671825e3e6b0e2ebfd6d61b543ffa98e5

Remove references to scaffolding.
[fr] rearrange tocs to follow en
[fr] Follow 91702c053bfae5ff14ce47e3c6d69ff7d6f3c9bd

Fix more broken links.