Added skeleton and TODOs of the openfire plugin
Added basic implementation of HistoryEntry
Added Guava library
Implemented TF-IDF prediction engine
Combine features based on support and confidence
Use FP growth to generate frequent pattern and use TFIDF on all features
Fixed bugs in FPStore
User tokenizer and stemmer to process messages
Added support of tokenizing Chinese
Implemented HistoryDatabaseAdapter
Updated db schema to accept null locations and use identity for ID
Exclude resources from sender and receiver stored in DB
Merge branch 'server' into development