* [BUFFER] Smarter slice to detect compactness

* move simplify of begins early

[TOPI] Add broadcast and reduce operators

* [RUNTIME][PASS] Allow declare vector type array

* fix bcast

* [BUFFER] Enable vload/store function in buffer

* ok

* [GRAPH] Add GraphHandle

* Move to apps/graph_executor

* [STORAGE][BUFFER] Support access ptr for clear access pattern.

* fix lint

* [C API] Make DSL API registerable, add copy from/to raw bytes

* fix cython

* [CODEGEN/PASS] add restricted, alignment option

* fix lint

* Fix the alloca

* [IR] Add body to AssertStmt

* fix lint

* [OP] Initial start of op library

* add gtest

* Support for batch ComputeOp

* Support for batch ComputeOp

* Fix CrossThreadReduction

* Fix lint

* Add UpdateArray, remove support for batch reduce

* Tuple input support for reduce

* rfactor works with multiple reducer; support multiple reducers with different types

* Small fix

* Small fix

* Change return type of rfactor to Array<Expr>

* Fix lint

* Improve

* Add tutorial

* Improve tutorial

* Improve tutorial

* [LANG] CommReducer

* Reorganize c_api

* Remove InitValue and Combine; refactor Functor

* Make CommReducer an Expr

* Make comm_reducer type independent

* Make CommReducerNode a Node

* Small fix

* Refine

* Refine front api; add integration testcases for min/max

* Fix python

* Refine

* Fix lint and add example

* [LANG/GPU] Cross Thread Reduction.

* Fix doxygen error

* Upgrade verilog testcase to new one

* [RUNTIME] Refactor runtime to be DLPack compatible. Enable plugin of new runtime.

* fix mac compile

* ok

* [IterVar/REFACTOR] Add types to IterVar

* [ARITH/REFACTOR] Move IntSet to include

* [REFACTOR/OP] Move Op detail to seperate folder.

* fix test

[TEST/PYTHON] Add unittest folder, add a build pipeline. Rename Buffer.ptr to Buffer.data to be consistent with Array. (#29)

* [CODEGEN] CUDA/OPENCL pipeline complete

* Hide TVMType by str in frontend

* [LANG] Include buffer semnatics, introduce pylint

* Refactor inline add support for buffer indexing

* fix doc

* [LANG] Change Schedule->Stage, Use Schedule for global schedule

* add numpy as dep

* add numpy installation, temporary disable osx

* [PASS] Schedule Ops init working version

* bugfix in PassUp