[WIP] Configure Travis CI notifications

[atugushev]

TBD

Refs #853

[codecov]

Codecov Report

Merging #903 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #903   +/-   ##
=======================================
  Coverage   99.06%   99.06%           
=======================================
  Files          35       35           
  Lines        2247     2247           
  Branches      288      288           
=======================================
  Hits         2226     2226           
  Misses         13       13           
  Partials        8        8

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