Translate nested keys using square brackets like those with periods

Fixes #267

For example, the following inputs will both be translated with the same
(Laravel) translation rule:

    Former::text('address[city]')
    Former::text('address.city')

    [ 'validation' => [
        'attributes' => [
          'address' => [
            'city' => 'City'
Merge pull request #274 from rmasters/brackets-translations

Translate fields using square brackets like those with periods
Instantiate the MethodDispatcher through an IoC container

So that MethodDispatcher->addRepository() can be called
Merge pull request #278 from weotch/ioc-dispatcher

[L4] Instantiate the MethodDispatcher through an IoC container
Reafect a group's label even when group is present
Allow specific checkboxes to override the global push_checkboxes

My use case is that you've set the `push_checkboxes` config option to true, but there is a single checkbox instances you want to **not** push checkboxes.  This change makes it so a checkbox will push a hidden field only if the global config is set AND the checkbox hasn't been explicitly set to not push.
Fixing issue revealed by Travis test
Adding a test for overriding globally pushed checkboxes
Merge pull request #286 from weotch/patch-1

Allow specific checkboxes to override the global push_checkboxes
Composer updates
Merge pull request #297 from GrahamCampbell/composer

Composer Updates
changing inline help in ZurbFoundation and ZurbFoundation4 so that form validation help text can be styled properly (like Bootstrap)
Merge pull request #298 from adamfeuer/zurb4-form-validation-help-fix

BUGFIX [AGNOSTIC] fixing inline form validation display for Zurb
add framework option to ZurbFoundation4 to allow setting of validation alert styles
Fix unit tests.
Merge pull request #301 from claar/develop

Fix unit tests.
Fix grouped checkbox repopulating from POST and the Populator.
Merge pull request #302 from claar/grouped-checkboxes

Fix grouped checkbox repopulating from POST and the Populator.
Fix and test multiple select repopulation.
Merge pull request #304 from claar/multiselect

Fix and test multiple select repopulation.