[MRG] Add sqlite support

[vinayak-mehta]

Closes #212.

[codecov-io]

Codecov Report

Merging #244 into master will decrease coverage by 0.85%.
The diff coverage is 11.76%.

@@            Coverage Diff             @@
##           master     #244      +/-   ##
==========================================
- Coverage   87.33%   86.48%   -0.86%     
==========================================
  Files          13       13              
  Lines        1492     1509      +17     
  Branches      346      349       +3     
==========================================
+ Hits         1303     1305       +2     
- Misses        129      144      +15     
  Partials       60       60

Impacted Files	Coverage Δ
camelot/cli.py	86.32% <ø> (ø)	⬆️
camelot/core.py	87.63% <11.76%> (-3.72%)	⬇️

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