Add queryset save api

[JarnoRFB]

Closes #27

[review-notebook-app]

Check out this pull request on ReviewNB: https://app.reviewnb.com/JarnoRFB/incense/pull/37

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[codecov]

Codecov Report

Merging #37 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #37   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         278    295   +17     
=====================================
+ Hits          278    295   +17

Impacted Files	Coverage Δ
incense/artifact.py	100% <100%> (ø)	⬆️
incense/query_set.py	100% <100%> (ø)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #37 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #37   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         278    297   +19     
=====================================
+ Hits          278    297   +19

Impacted Files	Coverage Δ
incense/artifact.py	100% <100%> (ø)	⬆️
incense/query_set.py	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6508af8...b92b172. Read the comment docs.