GitLab

* reorg the doc mainpage

* contribute guide

* remove loading backend in sse

* build mxnet in a second run

* a third run to fix everything

* fix docstring in sampler

* fix docstring in transformer

* README for doc build

* some reordering and printing

* use filename_pattern instead of ignore_pattern to reduce warning at the cost of redundant work...

* add env var to use mxnet in Jenkinsfile

* remove step 3, it's already fixed by previous commit

* setup sphinx-gallery; work on graph tutorial

* draft dglgraph tutorial

* update readme to include document url

* rm obsolete file

* Draft the message passing tutorial