Update sitemap module sitemap.php

This fix is included to solve this bug: https://github.com/pyrocms/pyrocms/issues/2838
Now the function check if there are posts with status "Live", if the count is 0 then the loop doesn't print the blog link to the sitemap
Illuminate\Database\Schema\Builder depends on Doctrine\DBAL\Schema\MySqlSchemaManager but it was not specified as a require in the Illuminate composer.json. So we need to add it here.
Fix “unknown database type enum requested”

	* Should probably be addressed in Doctrine, if not in Illuminate\Capsule
	* Doctrine 2: Resolving “unknown database type enum requested” - http://wildlyinaccurate.com/doctrine-2-resolving-unknown-database-type-enum-requested
	* Unknown enum database type in migration file / Doctrine issue - https://github.com/laravel/framework/issues/1346
	* Error when mapping database enum field type - https://github.com/symfony/symfony/issues/866
Oops forgot to get the class name.
Merge https://github.com/pyrocms/pyrocms into 2.3/develop
Merge branch '2.3/develop' of https://github.com/ChristianGiupponi/pyrocms into 2.3/develop
Merge pull request #2872 from ChristianGiupponi/patch-2

Update sitemap module sitemap.php mkay?
New model returns different tree / items structure

This properly sifts out if there are child items and prevents a nasty
array to string error in Lex.
Merge pull request #2890 from obrignoni/2.3/fix-doctrine-dependency

2.3/fix doctrine dependency
Started setting up the folder structure and playing with some ideas for Streams PSR.
We can eloquently create streams
We can eloquently update streams. Added FieldAssignment accessors / mutators
Adding more relations, accessors and mutators
Minor edit
Merge pull request #2907 from obrignoni/2.3/feature-PSR-Streams

2.3/feature psr streams
Check if runtime cache is set before returning value or return false
Adding the ability to return the entry collection formatted or unformatted. See comments for details.
Fixing users a little bit.
Progress
Merge pull request #2911 from obrignoni/2.3/fix-users-2

2.3/fix users