Upgrade Checkstyle version and fix Regression

[rnveach]

Based on CI run at #87 , Checkstyle has been modified too much that our regression isn't working anymore.

https://travis-ci.org/checkstyle/regression-tool/jobs/302059902

[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /home/travis/build/checkstyle/regression-tool/checkstyle/src/test/java/com/puppycrawl/tools/checkstyle/ExtractInfoGeneratorTest.java:[34,48] cannot find symbol
symbol: class CheckUtil
location: package com.puppycrawl.tools.checkstyle.internal
[ERROR] /home/travis/build/checkstyle/regression-tool/checkstyle/src/test/java/com/puppycrawl/tools/checkstyle/ExtractInfoGeneratorTest.java:[49,56] cannot find symbol
symbol: variable CheckUtil
location: class com.puppycrawl.tools.checkstyle.ExtractInfoGeneratorTest
[INFO] 2 errors

[rnveach]

When I upgrade checkstyle version, I get the following test errors. I tried fixing them but then I get issues because of line endings that I can get around yet and I don't know why this is happening with the next version.

Failed tests: testGenerateConfigTextWithMiscModuleInfos(com.github.checkstyle.regression.configuration.ConfigGeneratorTest): Config is not as expected
testGenerateConfigTextWithCheckerParentModule(com.github.checkstyle.regression.configuration.ConfigGeneratorTest): Config is not as expected
testGenerateConfigTextWithEmptyModuleInfos(com.github.checkstyle.regression.configuration.ConfigGeneratorTest): Config is not as expected
testGenerateConfigTextWithTreeWalkerParentModule(com.github.checkstyle.regression.configuration.ConfigGeneratorTest): Config is not as expected

[rnveach]

Fix was merged