Add support of maven-encrypted passphrases

* Add META-INF/plexus/components.xml resource with correct
  settings-security.xml file location. This is required
  due to https://github.com/sonatype/plexus-sec-dispatcher/pull/1
* Update plexus-utils version to have access to the
  org.codehaus.plexus.util.xml.XmlStreamReader
  The previous version caused an error on build.

See http://maven.apache.org/guides/mini/guide-encryption.html for
details.
Merge pull request #140 from roman-kashitsyn/mvn-sec

Add support of maven-encrypted passphrases