[IZPACK-1039]
  - According to the issue having Maven 2.2.1 mininum requirement
    added maven-enforcer-plugin and added prerequisites accordingly.
  - Updated README.md file accordingly.
  - Enhanced m2e configuration to added izpack-maven-plugin and
    maven-enforcer-plugin and make Eclipse happy.
Merge pull request #162 from khmarbaise/IZPACK-1039

[IZPACK-1039]