[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.
Merge pull request #165 from khmarbaise/IZPACK-1047

[IZPACK-1047]
[IZPACK-1048]
  - Changed exception handling in plugin.
[IZPACK-1048]
 - Fixed typo in exception message.
Merge pull request #166 from khmarbaise/IZPACK-1048

[IZPACK-1048]
[IZPACK-1051]
  - Fixed maven-site-plugin for profile.
Merge pull request #167 from khmarbaise/IZPACK-1051

[IZPACK-1051]
Update to allow empty file field.
Changes to support empty file.
Test suite
Fix formatting problem
Merge pull request #168 from mheinze/master

Jira issue IZPACK-1058
Fix for IZPACK-943

Check the URL for null before creating the ImageIcon. Add a loadIcon()
method to factorize code.
Fix issue IZPACK-1060
Merge pull request #169 from sebastien-christy-neomades/IZPACK-943

Fix for IZPACK-943
Merge pull request #170 from sebastien-christy-neomades/IZPACK-1060

Fix issue IZPACK-1060
[IZPACK-1061] - UserInputPanel: Installer crashes on missing 'set' attribute for RuleInputFields
[IZPACK-1062] - Dynamic variables using checkonce="true" cannot be overwritten by internal variables with the same name
[IZPACK-1059] - AntActionInstallerListener - use graphical InputHandler instead of Ant's DefaultInputHandler in GUI environments
[IZPACK-1059] - AntActionInstallerListener - use graphical InputHandler instead of Ant's DefaultInputHandler in GUI environments