alpha

This version is a Code refactoring for SwiftSnails, the bottom of the the framework is changed to MPI.
Three demos is released:

• logistic : Logistic Regression
• word2vec: Word2Vec
• sent2vec: Paragraph Vector

Dependency:

• C++11 (gcc4.8+)
• ZeroMQ-4.0.5
• glog-0.3.3
• gtest-1.7.0
• zlib-1.2.8
• sparsehash-2.0.2
• openmpi-1.8.5
• gflags