Zero value parent_id instead of null values

[amochohan]

Currently, parent_ids must be null to work with this package. In my case, root level nodes have a value of 0, to denote a root level node.

I've taken a look at the code, and it'd be a matter of changing a few queries to add an additional where clause to account for zero values. Is this something that others may need?

[amochohan]

I've implemented this here:

https://github.com/drawmyattention/baum/commits/dev-zeroparentids

[poing]

Under New Management

Focusing support for later Laravel versions.

Cleaning up and closing some of the really old issues. Things that might still be a problem will be transfered to a consolidated issue.

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