Moved min-width to table cell (instead of sky-grid-cell)

[Blackbaud-AlexKingman]

Addresses #27

This should clear up issues where inner text in grid cell was getting truncated. This scenario only happens when:

1. all column widths are defined
2. column widths add up to be less that the total width of table
3. truncated item must be wider than the width given to column

[codecov]

Codecov Report

Merging #38 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files          10       10           
  Lines         542      542           
  Branches       82       82           
=======================================
  Hits          541      541           
  Misses          1        1

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