Added standard unit tests for SqsQueue and SqsJob which are compatible with 4.1+
Flagged exists as true when restoring the model
Enable array_forget to unset one or many keys
Add comment in MySQLGrammar
Fixing indentation modifyComment function
Added hasName method
Updated doc block for hasName
Update Router.php

Cleaned up method using @KennedyTedesco's suggestion.
Prevent a fatal error if Router->current is empty

Prevents a fatal error ("Call to a member function getAction() on a non-object") if currentRouteAction() is called and there is no current route.
Merge pull request #3777 from dcarrith/adding_sqs_unit_tests_4.1.x

Adding sqs unit tests to the 4.1.x branch
Remove broken community tests.
return void if nothing was updated on the model

Signed-off-by: Suhayb El Wardany <me@suw.me>
Making the return more succinct
Use nested where for where arrays
more robust exception message
replacing test dependency on C extension with existing stub
Add keyBy method to Collection
Adding sqs unit tests to the 4.2 branch.
Database\Query\Builder::groupBy() now accepts arrays as arguments

Also added unit tests.
Abolish Model::firstByAttributes