Enable coverage from XML configuration file

[Slamdunk]

Close #442
Close #344
Close #72

[codecov]

Codecov Report

Merging #514 into master will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master      #514   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       540       558   +18     
===========================================
  Files             28        28           
  Lines           1660      1686   +26     
===========================================
+ Hits            1660      1686   +26     

Impacted Files	Coverage Δ	Complexity Δ
src/Coverage/CoverageReporter.php	100.00% <100.00%> (ø)	11.00 <1.00> (+4.00)
src/Runners/PHPUnit/BaseRunner.php	100.00% <100.00%> (ø)	22.00 <0.00> (+1.00)
src/Runners/PHPUnit/Options.php	100.00% <100.00%> (ø)	96.00 <0.00> (+13.00)

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