Text expand max character size live update

[Blackbaud-MikitaYankouski]

The following changes expand the functionality of maxLength property of text-expand component and adds an associated test.

[blackbaud-sky-savage]

Tests passed. Automated cross-browser testing via BrowserStack and Travis CI shows that the JavaScript changes in this pull request are: CONFIRMED

Commit: 480f697
Build details: https://travis-ci.org/blackbaud-sky-savage/skyux2/builds/364694995

(Please note that this is a fully automated comment.)

[codecov-io]

Codecov Report

Merging #1615 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1615   +/-   ##
=======================================
  Coverage   99.98%   99.98%           
=======================================
  Files         391      391           
  Lines        7885     7889    +4     
  Branches     1152     1152           
=======================================
+ Hits         7884     7888    +4     
  Misses          1        1

Impacted Files	Coverage Δ
src/modules/text-expand/text-expand.component.ts	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1c8cc93...480f697. Read the comment docs.