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Co-authored-by: Minjie Wang <minjie.wang@nyu.edu>

* [Doc] Tree-LSTM in DGL, edit pass for readability

Edit for grammar and style. 
How about deleting the last line? "Besides, you..." It needs a transition or some context.

* Update tutorials/models/2_small_graph/3_tree-lstm.py

* Update tutorials/models/2_small_graph/3_tree-lstm.py

* [Doc] Small graphs readme.txt, edit pass

Edit for grammar and style. Should this be an .rst on .txt?

* Update README.txt

* minor spelling tweaks

* Update CONTRIBUTORS.md

* reorg the doc mainpage

* contribute guide

* update version; add news.md; modify contributing.md

* change urls to dmlc

* move pytorch code to examples.

* fix.

* fix tutorial

* fix all code tutorial links and typos in texts

* sse readme format

* fix

* sse paper link

* gat readme

* fix

* change Index.tolist -> Index.tonumpy; fix bug in traversal; remove dependencies in data

* fix import

* fix __all__ and some docstring

* improve capsule tutorial with jinyang

* fix wrong layout of second-level tutorial

* delete transformer