Change depth to 3 in examples

[Hribek25]

fixes #191

[todofixthis]

Hey @Hribek25 thanks for working on this!

Looks like there is one test failing; could you have a look at the Travis CI build result?

Once that's addressed, this should be ready to merge 😺

[Hribek25]

Hey @todofixthis , thanks for your guidance.

While changing depth=100 -> depth=3 I was changing it also in test routines and it turned out to not be best idea:) Changes to test routines were reverted back.

[todofixthis]

Looks good. I feel like we should set a default value for depth in the routines as well, but maybe we'll make that a separate issue, since it currently doesn't have a default value.

I just changed the target branch to develop, which introduced a couple of conflicts (we're currently in the middle of PEP-8-ifying the codebase). Once those conflicts are resolved, this PR is ready to merge 😺

[todofixthis]

Cheers for that! I will give it a final once-over this weekend 😺

[todofixthis]

Looks good. Thanks @Hribek25 !