Support old ver

Merge pull request lazychaser#171 from SeoFood/v4

Laravel 5.4

Merge pull request lazychaser#151 from ceesvanegmond/v3

Feature: Decrease number of queries used by nested set

Bump v

lazychaser#96: don't fill children when rebuilding tree

Allow l5.3

Merge pull request lazychaser#119 from oddvalue/patch-1

Start new nested set query in fixTree

Fixed lazychaser#103: descendants now restored

Added some assertions

Fixed lazychaser#93: works with prefixed tables