Provision instead of destroy after adding sites

Replaces #793
As said in the change log Laravel 4.2 needs PHP > 4.0
Corrected cross link to queues documentation
Add note on encrypt key for iron queues.
Add note about cipher

See original discussion in https://github.com/laravel/framework/pull/4030 and confusion in https://github.com/laravel/framework/issues/4545 and https://github.com/laravel/laravel/pull/2945
Clarify SoftDeletingTrait is mandatory now in 4.2

The former "You should now use the..." and "You should also..." made it seem like using the trait was merely suggested, not required.
Updated validation docs with boolean rule

This is for PR https://github.com/laravel/framework/pull/4599 if the boolean validation rule is approved (so the docs can be updated at the same time).
Merge pull request #812 from TheShiftExchange/patch-3

Updated validation docs with boolean rule
Merge pull request #810 from tonydew/4.2

Clarify SoftDeletingTrait is mandatory now in 4.2
Merge pull request #807 from barryvdh/patch-1

Add note about cipher
Merge pull request #804 from mnishihan/patch-2

Corrected cross link to queues documentation
Merge pull request #801 from montogeek/patch-1

As said in the change log Laravel 4.2 needs PHP > 4.0
Merge pull request #798 from Maatwebsite/patch-2

Provision instead of destroy after adding sites
Merge pull request #806 from Garbee/4.2

Add note on encrypt key for iron queues.
Update upgrade.md
highlight storage path in permission section
Updated validation docs with timezone rule

This is for PR laravel/framework#4600, since it got merged.
Update homestead.md

Fix typo
Remove 'deleted_at' from default date mutators
Fix array.