GraphsGeneratorListener: add filter regular expression and period time

Signed-off-by: fhenry <felix.henry@sopra.com>
PluginsCMDWorker: Added some JUnit tests

Signed-off-by: fhenry <felix.henry@sopra.com>
Fixed changelog merge conflicts

Signed-off-by: fhenry <felix.henry@sopra.com>
Merge branch 'master' of https://github.com/DaftCoke/jmeter-plugins

Conflicts:
	site/dat/wiki/Changelog.wiki