This commit extends the gradle and rake tasks to pass through a list of files
for rubocop to lint. This allows more specificity and fine grained control for
linting when the consumer of the tasks only wishes to lint a select few files.
Adds rubocop as a linter for ruby.:
- Adds .rubocop.yml which defines specific config on top of default
- Adds Gradle task 'lint' task
- Adds 'lint:report' rake task to report Lint Cops.
- Adds 'lint:format' rake task to automatically format the code.
