Fixed lazychaser#51

Merge pull request lazychaser#48 from JN-Jones/master

Laravel 5.1 support

Fixed issues with forced deletion when using SoftDeletes

Merge branch 'master' of github.com:lazychaser/laravel-nestedset

Conflicts:
	README.markdown

Added few query builder constraints

Merge pull request lazychaser#36 from thijskok/master

Fix missing $connection parameter for newFromBuilder method

getDescendants now returns empty collection if node doesn't exists

Merge branch 'master' of github.com:lazychaser/laravel-nestedset

CHanged version constraints

Added some other checks