[fr] update getting-started folder

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[fr] update cakephp-overview folder

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Fixing references of CakeEventListener, now called EventListener.
Merge pull request #1617 from renan/3.0-event-listener

Fixing references of CakeEventListener, now called EventListener
updated example to reflect correct name
Merge pull request #1618 from aydot/patch-1

updated example to reflect correct name
installation instructions update
Merge pull request #1619 from antograssiot/3.0_installation

3-0 installation instructions update
[fr] follow #1614

3.0 correct link to ProGit book
[fr] follow c6547b5

Update info regarding return value from authenticate provider.
[fr] follow #1613

Shell::param()
[fr] follow #1610

Fix eg. code.
[fr] follow #1611 & follow en

3.0 doc correct model link on index page
[fr] follow 62eece1

Fix example code.
[fr] follow #1602

table-objects, fix deleteAll example
[fr] follow #1601

Update docs for App::objects() removal.
[fr] rearrange logging to follow en
[fr] update files from root folder

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