Added gradle wrapper.
Playing with java8 lambdas project.
Examples for filter and map.
Example for min and max of a stream.
Equality for artist class.
Album entity.
Report if it is a solo band or not.
Refactoring test data into DataSample class.
Adding reports and checkstyle.
Get tracks that last more than one minute.
Moving classes from core.core package to core.
Get track names that last more than sixty seconds.
Some tests for chapter 3.
Exporting org-mode to markdown with no time report.