Allow App::down() callback to be configurable based on app requirement. Fixes #1701.

Signed-off-by: crynobone <crynobone@gmail.com>
Update DatabaseStore.php
Update FileStore.php
Update MemcachedConnector.php
Update MemcachedStore.php
Update Section.php
Merge pull request #1976 from fturmel/cache-phpdocs-cleanup

Illuminate\Cache phpdocs cleanup
Merge pull request #1717 from crynobone/feature/down-callback

Allow App::down() callback to be configurable based on app requirement. Fixes #1701.
Update change log.
Added Request::format function to get a human-friendly format string for the request.
Allow array sizes to be checked by validator.
Rename getResults on relationships to get.
Added support for where conditions on unique validation rule.
Restore method on Eloquent models now fires restoring and restored events.
Fix bug with relations.
Only build optimize file in non-debug mode or when --force flag is used.
Make pattern filters show in routes table.
Fixing radios and checkboxes with old input (finally).
Update change log.
Fix form tests.