Skip theme css.js files for coverage

[agubler]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

Should skip the generated css.js themes files for coverage.

[codecov]

Codecov Report

Merging #165 into master will increase coverage by 7.75%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage    91.7%   99.45%   +7.75%     
==========================================
  Files          30       18      -12     
  Lines        1001      923      -78     
  Branches      278      278              
==========================================
  Hits          918      918              
+ Misses         78        0      -78     
  Partials        5        5

Impacted Files	Coverage Δ
_build/themes/dojo/select.m.css.js
_build/themes/dojo/radio.m.css.js
_build/themes/dojo/checkbox.m.css.js
_build/themes/dojo/tabPane.m.css.js
_build/themes/dojo/slidePane.m.css.js
_build/themes/dojo/comboBox.m.css.js
_build/themes/dojo/textarea.m.css.js
_build/themes/dojo/button.m.css.js
_build/themes/dojo/dialog.m.css.js
_build/themes/dojo/textinput.m.css.js
... and 2 more

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