Implement options in Memory driver

[groenroos]

Implements the limit, skip and sort options in the Memory driver.

Closes #163

[codecov]

Codecov Report

Merging #421 (b5bac20) into master (e4c28f5) will decrease coverage by 0.02%.
The diff coverage is 94.11%.

@@            Coverage Diff             @@
##           master     #421      +/-   ##
==========================================
- Coverage   98.05%   98.02%   -0.03%     
==========================================
  Files          37       37              
  Lines        4575     4607      +32     
==========================================
+ Hits         4486     4516      +30     
- Misses         89       91       +2     

Impacted Files	Coverage Δ
drivers/db/Memory.js	98.41% <93.93%> (-0.68%)	⬇️
lib/Storage.js	89.81% <100.00%> (ø)

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