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

Signed-off-by: crynobone <crynobone@gmail.com>
Fix a bug with JSON responses.
Added mediumText and longText to schema builder.
Throw exception when trying to release a pushed IronMQ job.
Throw exception if SQLite database doesn't exist.
Allow macros on the Response class.
Respect environment when setting app key.
Make password reminder configurable.
Make password reminder expire time configurable.
Added support for view creators in addition to composers.
Update DatabaseStore.php
Update FileStore.php
Update MemcachedConnector.php
Update MemcachedStore.php
Update Section.php
Fix typo in variable.
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.