move out nlp components

[imgarylai]

This elit project will only be the sdk for deployment to the cloud. Since we have many overlapping with gluon nlp, it might be a better way for us that we contribute nlp model to there. Since then, we don't have to care about having a unified api interface for each nlp component.

In the future, developers don't have to worry about how should implement their component. The only thing they should care about is the decode function.

I have created a snapshot on https://github.com/elitcloud/elit/tree/nlp for this move out process. I'm gonna move out every components after this commit 9e4f1855b8aa06f51b49aa2b62f97e2df8893af8.

@hankcs would you please move your parser to https://github.com/elitcloud/parser?

Please leave your ideas/thoughts here for further discussion.

Best