Stable for Production

This version is used by myself for months, and it always works as expected.

We had added more cache class for this version, like:

1. AlignmentCache
2. EmbeddingCache
3. FaceCache
   etc.

Please read the code for the details.

Thanks for your attention!

First version with alignment & embedding generator!

Facenet model original hosted at Google Drive, which will not easily be downloaded at here: https://github.com/davidsandberg/facenet/wiki