Allowing submission of class files.
Adding implementation for neutral instance weighing.

Neutral instances are now weighed and considered. The WeightHandler class has been updated to support weighing algorithms and weights are now normalized.
Adding .class files.
Adding multiple optimization level results.

1) Results added for Neutral and Polarity Instance weighing
2) Results added for the original none optimized
3) Changed the incorrectly labelled Original results to StemmedAndStopwords results
Merge branch 'master' of https://github.com/mjavaid/weka-tweeter