Travis tests

[emirb]

• Added Travis tests (including upcoming PHP 7.2) so we can have matrix-based tests for all PHP versions.
• Added codecov integration for generating code coverage

[emirb]

@derickr Can you please enable Travis integration for this repository? Then you can trigger a new build.

[derickr]

Closing and re-opening to trigger Travis

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@d93e22b). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #19   +/-   ##
=========================================
  Coverage          ?   63.09%           
=========================================
  Files             ?        2           
  Lines             ?      439           
  Branches          ?       67           
=========================================
  Hits              ?      277           
  Misses            ?      162           
  Partials          ?        0

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