ApplicationSub->offsetExists doesn't return value
Fix phpdocs

Mostly fully qualified namespaces, incorrect classes or wrong/missing
return values.
Typos in Collection
Reimplemented `keep` and `reflash` for preserving flash data across more than one request.
Merge pull request #1099 from barryvdh/phpdoc-fixes2

phpDoc fixes
Merge pull request #1098 from barryvdh/patch-2

ApplicationSub->offsetExists doesn't return value
Throw exceptions on URL::action when action not found. Fixes #1097.
Allow data to be merged on views, useful for blade includes. Closes #1095.
Work on SerializableClosure.
Swallow exceptions on mail job delete.
Check for hash in "isValidUrl". Closes #1074.
Remove from old flash when a var is flashed.
Updated readme. Closes #1073.
Remove automatic key setting in Eloquent lists, as it causes problems. Fixes #1069.
Added ability to pass `Closure` as third parameter to `Route::model` to determine not found behavior. Closes #1062.
Remove intended location from session before redirect.
Allow for `Class@method` syntax to be used with `Validator::extend`. Closes #1061.
Added `@overwrite` Blade directive for forcing a full section overwrite.
Use hash_hmac SHA-1 when generating reminder tokens. Closes #1040.
Upper case on method check. Fixes #1109.