Feature/tasx 5 task domain class

A couple of things regarding the code in the above method. Use the greater / less than signs to compare things instead of using the compareTo method. It is more readable. See: http://groovy.codehaus.org/Operator+Overloading

Also, since you're within the same class, you can just use "from < instant" instead of "this.getFrom().compareTo(instant) < 0)". As you can see the groovy equivalent is more concise and easier to read than the java style.