Record count

[groenroos]

Instead of returning just the dry array of data from Storage methods, return an object that contains data and a count for the total count of records returned. This opens up opportunities for further metadata to be included later.

Still a bit woolly around how the delete method communicates data-less success, but this can be improved later.

The MongoDB driver will have to change a little bit too to accommodate these adjustments.

Closes #171.

[codecov]

Codecov Report

Merging #415 (f211a50) into master (6ceef8e) will decrease coverage by 0.14%.
The diff coverage is 88.33%.

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
- Coverage   98.18%   98.04%   -0.15%     
==========================================
  Files          37       37              
  Lines        4517     4547      +30     
==========================================
+ Hits         4435     4458      +23     
- Misses         82       89       +7     

Impacted Files	Coverage Δ
lib/Storage.js	89.81% <84.78%> (-0.76%)	⬇️
core/loadCustomTags.js	100.00% <100.00%> (ø)
drivers/db/Memory.js	99.11% <100.00%> (+0.01%)	⬆️
hooks/sapling/user/recover.js	100.00% <100.00%> (ø)
hooks/sapling/user/register.js	98.09% <100.00%> (ø)
hooks/sapling/user/update.js	100.00% <100.00%> (ø)
lib/Response.js	98.46% <100.00%> (-0.05%)	⬇️

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