Fix typos and some of the NetBean's warnings.
Fix #109: NPE with Pentaho 5.0 EE

Exclude xmlParserAPI from dependencies.

http://github.com/mysticfall/pivot4j/issues/issue/109
Fix a problem which corrupted plugin artifacts.
Fix #106: Replace Logback with Log4J 2.0
#106: Fix conflict with the bundled SLF4J library.
Merge branch 'master' of https://github.com/mysticfall/pivot4j