DB management functions and Word Model added.
Added Feature Model
Removed gold_standard parameter
GoldWord Model added
SeedWord Model added.
Dictionary Model added.
Lexicon Model added.
Polarity Word Model added.
Synonym and Antonym Relations Models added.
BaseDBI and WordDBI refactored to use SQLAlchemy. db_conf and db_utils files removed.
FeatureDBI refactored to use SQLAlchemy.
SeedWordDBI refactored to use SQLAlchemy.
Corpus Extraction tool now uses SeedWordDBI with SQLAlchemy.
Merge branch 'master' of https://github.com/shcherbin/ppe