Add cyclomatic complexity check in analysis

[rju]

Checkstyle provides the functionality to evaluate the cyclomatic complexity of methods in a Java class. However, it is cumbersome to configure Checkstyle in a way that it scan all methods of the project and display the result. Furthermore, it does not provide an aggregation of these results.

Therefore, it is necessary to include such checkstyle analysis for cyclomatic complexity and return all measurements to the Analysis Result View and provide a summary in the way:
projectName + " cyclomatic complexity <=1", 4 (meaning 4 methods have a complexity lower or equal 1
projectName + " cyclomatic complexity <=3", 2
...
projectName + " cyclomatic complexity >10", 0

These results should also be saved when the save action for the view is triggered.