[IZPACK-1047]

  - Fixed build problem on debain / wheezy
  - Updated several plugin versions
    maven-source-plugin 2.2.1
    maven-site-plugin 3.3
    maven-compiler-plugin 3.1
    maven-clean-plugin 2.5
    maven-jar-plugin 2.4
    maven-release-plugin 2.8
  - Fixed m2e eclipse plugin configuration accordingly.