fixed a problem with the classloader and did some minor refactoring

[PeJetuz]

@pnatashap @yegor256 Please review, I fixed the classloader issue and did some minor refactoring.

[yegor256]

@pnatashap what do you think about this one?

[PeJetuz]

@pnatashap @yegor256
Maybe I should change:
<exclude>duplicatefinder:org.apache.xmlgraphics:batik-ext:1.7|org.w3c.dom.*</exclude>

for this option:
<exclude>duplicatefinder_ignoredResourcePatterns:about.htmlindex.html</exclude>
<exclude>duplicatefinder_ignoredClassPatterns:org.w3c.dom.*|org.codehaus.plexus.configuration.PlexusConfiguration</exclude>
<exclude>duplicatefinder_ignoredDependency:org.apache.xmlgraphics:batik-ext:1.7|xml-apis:xml-apis:1.0.0</exclude>

or a little shorter:
<exclude>duplicatefinder_resourcePatterns:about.htmlindex.html</exclude>
<exclude>duplicatefinder_classPatterns:org.w3c.dom.*|org.codehaus.plexus.configuration.PlexusConfiguration</exclude>
<exclude>duplicatefinder_dependency:org.apache.xmlgraphics:batik-ext:1.7|xml-apis:xml-apis:1.0.0</exclude>
?
The ignoredResourcePatterns, ignoredClassPatterns and ignoredDependencies parameters correspond to the plugin settings.

[PeJetuz]

@yegor256 @pnatashap ping