Checkstyle Fail build if checkstyle fails

[blakesteve]

Build now fails when checkstyle checks fail in the travis build

[codecov-io]

Codecov Report

Merging #636 into develop will increase coverage by 12.2%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop     #636      +/-   ##
=============================================
+ Coverage      47.27%   59.48%   +12.2%     
- Complexity      1131     1617     +486     
=============================================
  Files            337      363      +26     
  Lines           6927     7116     +189     
  Branches         430      431       +1     
=============================================
+ Hits            3275     4233     +958     
+ Misses          3373     2555     -818     
- Partials         279      328      +49

Impacted Files	Coverage Δ	Complexity Δ
.../watson/developer_cloud/service/WatsonService.java	74.21% <ø> (+3.12%)	37 <0> (+2)	⬆️
...son/developer_cloud/alchemy/v1/model/Document.java	10% <0%> (-18.58%)	1% <0%> (ø)
...son/developer_cloud/alchemy/v1/model/Language.java	5.26% <0%> (-9.68%)	1% <0%> (-2%)
...atson/developer_cloud/alchemy/v1/model/Entity.java	3.57% <0%> (-8.34%)	1% <0%> (ø)
...loud/discovery/v1/model/collection/Collection.java	10% <0%> (-8.19%)	1% <0%> (-1%)
.../personality_insights/v2/model/ProfileOptions.java	60.41% <0%> (-3.44%)	8% <0%> (-6%)
.../personality_insights/v2/model/AcceptLanguage.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...oud/personality_insights/v3/model/ContentItem.java	17.85% <0%> (ø)	3% <0%> (?)
...anguage_translator/v2/model/TranslationResult.java	23.07% <0%> (ø)	3% <0%> (?)
...nguage_translator/v2/model/CreateModelOptions.java	37.5% <0%> (ø)	2% <0%> (?)
... and 168 more

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