fix exports to work from importing app

[mandolyte]

This change is 

[codecov]

Codecov Report

Merging #49 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   45.34%   45.34%           
=======================================
  Files          21       21           
  Lines        2064     2064           
  Branches      594      594           
=======================================
  Hits          936      936           
  Misses        742      742           
  Partials      386      386           

Impacted Files	Coverage Δ
src/core/BCS-usfm-grammar-check.js	55.26% <ø> (ø)
src/core/annotation-row-check.js	0.00% <ø> (ø)
src/core/annotation-table-check.js	0.00% <ø> (ø)
src/core/book-package-check.js	52.70% <ø> (ø)
src/core/field-link-check.js	0.00% <ø> (ø)
src/core/field-text-check.js	59.82% <ø> (ø)
src/core/file-text-check.js	53.19% <ø> (ø)
src/core/manifest-text-check.js	4.25% <ø> (ø)
src/core/markdown-text-check.js	81.81% <ø> (ø)
src/core/plain-text-check.js	4.65% <ø> (ø)
... and 8 more

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