Bugfix 5063/Fixes for white space on USFM export

[PhotoNomad0]

Changes

• fixes for white space retention on alignment merge (on export)
• added a bunch of test cases.

Testing

• unit tests should pass on Travis

This change is 

[codecov]

Codecov Report

Merging #9 into master will increase coverage by 0.78%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   87.07%   87.86%   +0.78%     
==========================================
  Files           4        4              
  Lines         503      511       +8     
  Branches      106      108       +2     
==========================================
+ Hits          438      449      +11     
+ Misses         46       44       -2     
+ Partials       19       18       -1

Impacted Files	Coverage Δ
src/js/utils/verseObjects.js	84.47% <88.88%> (+1.57%)	⬆️

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[richmahn]

Reviewed 9 of 12 files at r1, 4 of 4 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @PhotoNomad0)