update namespaces
Merge pull request #1671 from antograssiot/3.0

3.0 update namespaces
Removing cakefest banner
update own configuration engine
Merge pull request #1674 from antograssiot/3.0-configuration-engine

3.0 update own configuration engine
Fix namespace to match conventions in CakePHP.
update App\Configure\Engine namespace
Add info about Inflector updates.
patchEntity clarification.

Clarifying that save() method still needs to be called after patching an entity.

Due the new ORM in CakePHP 3, I find it important to clarify this to developers.
Fixing syntax in methods name.
Merge pull request #1677 from gmansilla/patch-5

patchEntity clarification.
Follow up entity patching edits, refs #1677
Merge pull request #1676 from cakephp/3.0-inflector

Add info about Inflector updates.
add folder & file to migration guide
update namespace
Merge pull request #1678 from antograssiot/3.0-move-file

3.0 move File & Folder
update exception
add missing exception
update folders and remove outdated part
replace CakeErrorController by ErrorController