Add code style check in travis

[renanbr]

... and fix violations.

closes #81

[codecov]

Codecov Report

Merging #86 into master will increase coverage by 0.78%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master      #86      +/-   ##
============================================
+ Coverage     90.79%   91.58%   +0.78%     
  Complexity      202      202              
============================================
  Files            13       13              
  Lines           489      487       -2     
============================================
+ Hits            444      446       +2     
+ Misses           45       41       -4     

Impacted Files	Coverage Δ	Complexity Δ
src/Parser.php	100.00% <ø> (ø)	91.00 <0.00> (ø)
src/Processor/DateProcessor.php	100.00% <ø> (ø)	8.00 <0.00> (ø)
src/Processor/KeywordsProcessor.php	100.00% <ø> (ø)	3.00 <0.00> (ø)
src/Processor/LatexToUnicodeProcessor.php	89.47% <0.00%> (+15.56%)	10.00 <0.00> (ø)
src/Processor/NamesProcessor.php	76.63% <ø> (ø)	43.00 <0.00> (ø)
src/Processor/TagCoverageTrait.php	100.00% <ø> (ø)	6.00 <0.00> (ø)
src/Processor/TagNameCaseProcessor.php	100.00% <ø> (ø)	2.00 <0.00> (ø)
src/Processor/TagSearchTrait.php	100.00% <ø> (ø)	3.00 <0.00> (ø)
src/Processor/TrimProcessor.php	100.00% <ø> (ø)	8.00 <0.00> (ø)
src/Processor/UrlFromDoiProcessor.php	0.00% <ø> (ø)	7.00 <0.00> (ø)
... and 2 more

---

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 4e08261...33e64bb. Read the comment docs.