3.8

Issue #112: upgrade to checkstyle 7.8.2
Issue #130: remove surplus maven property, which leads to wrong checkstyle version displayed during run
Issue #130: fix ReturnCount checkstyle violations
Revert "Issue #49: disable unused imports inspection"
Revert "Issue #49: disablement of few fules as problem on TC is not going to be resolved quickly"
Issue #49: disable unused imports inspection
Issue #49: disablement of few fules as problem on TC is not going to be resolved quickly
Issue #49: extend violations for PackageNamingConvention to avoid violations
Issue #49: update for scope file to make it more clear that it does not work for TeamCity
Issue #49: resolve/suppress few inspection violations
Issue #49: resolve inspection violation for deprecated html tag - tt