Feature/add new 3.5 apis

[dothebart]

• add first wrapper for admin series calls to detect whether we're talking to a cluster or a single server

• add getResponsibleShard() to documents

• add named indices

• tests may now execute different tests depending on version and cluster of the SUT.

[codecov-io]

Codecov Report

Merging #151 into dev will increase coverage by 0.12%. The diff coverage is 79.61%.

@@            Coverage Diff            @@
##             dev     #151      +/-   ##
=========================================
+ Coverage   77.8%   77.92%   +0.12%     
=========================================
  Files         13       14       +1     
  Lines       2775     2854      +79     
=========================================
+ Hits        2159     2224      +65     
- Misses       616      630      +14

Impacted Files	Coverage Δ
pyArango/document.py	78.19% <33.33%> (-0.86%)	:arrow_down:
pyArango/theExceptions.py	51.7% <40%> (-0.42%)	:arrow_down:
pyArango/collection.py	72.03% <78.04%> (+1.03%)	:arrow_up:
pyArango/tests/tests.py	97.03% <87.87%> (-0.51%)	:arrow_down:
pyArango/admin.py	94.44% <94.44%> (ø)
pyArango/index.py	89.65% <0%> (+3.44%)	:arrow_up:

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