add currency field to accounts

[markormesher]

Part of #48 - just to get the dev and prod schemas synced for now

[codecov]

Codecov Report

Merging #49 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   86.87%   86.89%   +0.02%     
==========================================
  Files          69       69              
  Lines        1227     1229       +2     
  Branches      135      135              
==========================================
+ Hits         1066     1068       +2     
  Misses        161      161              

Impacted Files	Coverage Δ
src/commons/models/IAccount.ts	100.00% <ø> (ø)
src/api/db/models/DbAccount.ts	100.00% <100.00%> (ø)
src/commons/models/validators/AccountValidator.ts	100.00% <100.00%> (ø)

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