Depth parameter

[mastef]

We needed an option to require a maximum depth of nesting. The default behaviour still works with specifying a negative value -1, no nesting is done with 0 and depth can be specified with any values above.

I don't know if you still maintain the project, but if this is interesting for you please feel free to merge, then I'd remove our fork. Otherwise feel free to ignore :-)

Added also some further test cases to test for the depth and a different merge character.

Note : This is a breaking change, since a parameter was added.

Cheers!

[durple]

Thanks for the conribution. This is a difficult one since it is a breaking change.

Happy to accept with the following change. Add a fuction that takes the depth parameter and the existing function can stay the same. The existing function should just be a passthrough to the one with a depth parameter. We'd need these for both explodeMap and explodeList

e.g.

func explodeMap(l interface{}, parent string, delimiter string) (map[string]interface{}, error) {
    explodeMapWithDepth(i, parent, delimiter, -1)    
}

and

func explodeMapWithDepth(l interface{}, parent string, delimiter string, depth int) (map[string]interface{}, error) {
...
...
}

[durple]

Also, if you could squash your commits before submitting the PR, I'd really appreciate it since this is a single change.