Use matchWildcard for Memory driver

[groenroos]

#416 introduced a matchWildcard method for generally supporting matching patterns with asterisk based wildcards.

This PR implements that method for the Memory DB driver.

[codecov]

Codecov Report

Merging #417 (6ad95ce) into master (1cb6ee1) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #417   +/-   ##
=======================================
  Coverage   98.05%   98.05%           
=======================================
  Files          37       37           
  Lines        4581     4581           
=======================================
  Hits         4492     4492           
  Misses         89       89           

Impacted Files	Coverage Δ
drivers/db/Memory.js	99.11% <100.00%> (ø)
lib/Utils.js	100.00% <100.00%> (ø)

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