Return details for bulk imports

[thekie]

I added the return of the details for a bulk import to the end user of this library. We needed this for taking further actions and give the user feedback how their data import went.

It's a simple one line addition. I also added tests for the case of an exception and for the case of the return of the description data from the import.

Cheers

P.S. I had to fix on etest case in the unit tests and I added a ARANGODB_URL environmen var, in case some (like me) has running arango on a different port.

[codecov-io]

Codecov Report

Merging #115 into master will increase coverage by 0.3%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #115     +/-   ##
=========================================
+ Coverage   80.28%   80.59%   +0.3%     
=========================================
  Files          12       12             
  Lines        2141     2169     +28     
=========================================
+ Hits         1719     1748     +29     
+ Misses        422      421      -1

Impacted Files	Coverage Δ
pyArango/tests/tests.py	97.78% <100%> (+0.1%)	:arrow_up:
pyArango/collection.py	67.94% <100%> (+0.31%)	:arrow_up:

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[tariqdaouda]

Perfect, thank you.

Cheers,