Document TimeHelper::nice takes $format as param

As per the [TimeHelper::nice source code](https://github.com/cakephp/cakephp/blob/master/lib/Cake/Utility/CakeTime.php#L349), it can take $format as param. 

So Document that in the book.
Merge pull request #541 from PaulMougel/master

Fixed commas and typos in the french translation
Update saving-your-data.rst

Redundant use of "either"
Merge pull request #542 from spiliot/patch-4

Update saving-your-data.rst
[fr] Follow #542 and fix typos in fr/models/saving-your-data.rst
Merge pull request #543 from cakephp-fr/master

[fr] Follow #542
Update view.rst

Compléments sur l'utilisation des blocks dans les views/layouts.
Merge pull request #545 from TeddyBear06/patch-1

Update view.rst
Update view.rst

Added missing word "be"
Merge pull request #546 from openam/master

Update view.rst
Path to Plugin assets changed in 2.3
[fr] Fix some typos and finish translation of fr/views.rst
Merge pull request #549 from cakephp-fr/master

[fr] Fix some typos and finish translation of fr/views.rst
Path to Plugin assets changed in 2.1
Merge pull request #547 from savedario/patch-1

Path to Plugin assets changed in 2.1
Describe script() defaults & reflow verbiage.
Merge pull request #550 from MikeSchuette/patch-1

Describe script() defaults & reflow verbiage.
[fr] Folllow #550 in fr/core-libraries/helpers/html.rst

and fix typos
[fr] Fix underlines title and add missing parts in fr/plugins.rst
Remove incorrect 'echo' that results in an error

FormHelper::inputDefaults() returns an array, so its output should not be echoed.