Deleted Explorer and Manager, made VSData generalized
Update README.md
Split off Stochastic Learner into its own class
Implemented Stochastic learner
Simplified and refactored VSData class
Trimmed down VSData a bit more -- storing x_{i}s not necessary
Refactored stochastic learner and learner base class
Called base class ctor in stochastic learner
Added hypothesis and ctor for batch descent class