Merge pull request #108 from webdetails/master

- Bumped version of sparkl to fix the json serializer bug
Update Pivot4J plugin to #340 build

- Performance optimizations.
- Improved filter rendering.
- Misc. bug fixes.
Merge pull request #109 from mysticfall/master

Update Pivot4J plugin to #340 build
 'New version of plugin metadata'
 'New version of plugin metadata'
 'New version of plugin metadata'
 'New version of plugin metadata'
 'New version of plugin metadata'
 'New version of plugin metadata'