Is is used insted of instanceof

[thekie]

I changed x.__class__ is Y everywhere to instanceof(x, Y) where x is an object so that we can use subclasses of Y as well. This is useful in case we're injecting our own documentClass for a collection since the function to link documents are looking for instances of Document to use the _id property.

[codecov-io]

Codecov Report

Merging #116 into master will not change coverage. The diff coverage is 80%.

@@           Coverage Diff           @@
##           master     #116   +/-   ##
=======================================
  Coverage   80.28%   80.28%           
=======================================
  Files          12       12           
  Lines        2141     2141           
=======================================
  Hits         1719     1719           
  Misses        422      422

Impacted Files	Coverage Δ
pyArango/tests/tests.py	97.67% <ø> (ø)	:arrow_up:
pyArango/query.py	82.6% <100%> (ø)	:arrow_up:
pyArango/document.py	74.37% <100%> (ø)	:arrow_up:
pyArango/collection.py	67.62% <50%> (ø)	:arrow_up:

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[tariqdaouda]

Good call!