Support traversing a directory for finding .json files.  The assumption is that
all of these represent cucumber reports.  Full credit goes to Petmar from this thread
(https://github.com/masterthought/maven-cucumber-reporting-mojo/issues/4).
Merge branch 'master' of https://github.com/crankydillo/maven-cucumber-reporting-mojo into crankydillo-master

Conflicts:
	src/main/java/net/masterthought/cucumber/CucumberReportGeneratorMojo.java
Merge branch 'crankydillo-master'