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[Doc] fixed installation document

Doc

* setup sphinx-gallery; work on graph tutorial

* draft dglgraph tutorial

* update readme to include document url

* rm obsolete file

* Draft the message passing tutorial

Doc

Sync with upstream

To fix the compiler error on Mac OSX:

/dgl/src/c_api_common.cc:27:16: error: conversion from 'tvm::runtime::TVMArgValue' to 'size_t' (aka 'unsigned long') is ambiguous
        size_t which = args[0];

* fixing networkx conversion with 0 edges

* fixes as required

* remove obsolete comment

Sync with latest commit

[GraphIndex] Graph index and many related changes

* CI for lint check

* init submodule before run lint

* install ubuntu core for lint docker

* remove generator import in dgl

* gcn example test code

* GPU test

* use python3

* use functions

* gpu test use functions

* remove root

* use one script to run both cpu and gpu tests

* create synthetic data with scipy.

* changes as comments

* update mxnet.

* add get_tvmtype.

* remove undefined test.

* refactor frame codes

* fix unit test

* fix gcn example

* minor doc/message changes

* raise errors for non-exist columns in FrameRef; sanity check when append

* fix unittest; change error msg

* Add warning for none initializer

* fix unittest

* use warnings package

[Hotfix] Revert part of the send logic; disable the send twice test case; GCN on GPU works again. (#88)

Sync with latest commit