Add nodejs sequelize cache

[bsingr]

Add the Node.js sequelize SQL cache store.

This helps e.g. for tests to cache huge number of requests in a local sqlite database file.

[codecov]

Codecov Report

Merging #116 into master will decrease coverage by 2.56%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
- Coverage   99.33%   96.77%   -2.57%     
==========================================
  Files          11       12       +1     
  Lines         151      155       +4     
==========================================
  Hits          150      150              
- Misses          1        5       +4

Impacted Files	Coverage Δ
src/sequelize.js	0% <0%> (ø)

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