setup.py python-2.7 compatibility and ci checks

[tumb1er]

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[codecov-commenter]

Codecov Report

Merging #71 into master will increase coverage by 1.59%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   91.25%   92.85%   +1.59%     
==========================================
  Files          22       22              
  Lines        1612     1637      +25     
==========================================
+ Hits         1471     1520      +49     
+ Misses        141      117      -24     

Flag	Coverage Δ
#unittests	92.85% <100.00%> (+1.59%)	⬆️

Impacted Files	Coverage Δ
runtests.py	89.28% <ø> (-3.58%)	⬇️
celery_rpc/base.py	91.84% <100.00%> (+11.03%)	⬆️
celery_rpc/codecs.py	57.31% <0.00%> (-2.44%)	⬇️
celery_rpc/client.py	86.93% <0.00%> (-0.44%)	⬇️
celery_rpc/tests/test_m2m.py	94.59% <0.00%> (ø)
celery_rpc/tests/test_errors.py	99.46% <0.00%> (+<0.01%)	⬆️
celery_rpc/tests/test_pipeline.py	97.79% <0.00%> (+0.03%)	⬆️
celery_rpc/tests/test_client.py	98.98% <0.00%> (+0.04%)	⬆️
celery_rpc/tasks.py	90.32% <0.00%> (+1.89%)	⬆️
... and 2 more

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