get_*() consistency

[Aariq]

Pull Request

This addresses #193 and implements a consistent API and output (tibble) format for all get_*() functions.
It also adds a new (non-exported) utility function, matcher that maybe should superseed chooser eventually. This should be able to handle the match argument of most functions.

PR task list:

• [ x ] Update NEWS
• Add tests (if appropriate)
• [ x ] Update documentation with devtools::document()
• [ x ] Check package passed

[stitam]

Thanks @Aariq! I am very happy that this PR implements the conclusions of our earlier discussion, the tibble upgrade and matcher() are great! One thing I noticed, we seem to be increasing the number of dependencies (I also added data.tree in another PR), maybe this is something we should discuss in more detail in another issue.

[codecov-io]

Codecov Report

Merging #242 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #242   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          19      19           
  Lines        1750    1750           
======================================
  Misses       1750    1750           

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[stitam]

I think this PR is ready to be merged. Thanks @Aariq!!