* initial commit

* add python frontend and module tests

* add unit tests for function pass and optimize interface

* add ExprPass

* remove PassState and pass context for run

* add required_passes

* return module

* remove move

* fix minor reviews

* remove optimizer, optimizer->pass_manager, make pass a the base class of all

* remove deleted files

* move resolvedependency to sequential pass, use ir_pass namespace

* add todo

* add disabled passes in sequetialpass

* fix minor

* fix currying doc

* remove pass_kind from passnode

* remove pass kind from test

* fix doc

* fix per @tqchen's comments

* remove pass_manager.py create separate classes

* simplify pass_func

* inline using passfunc

* update doc

* disable test_quantize_pass for now

* create PassInfo class to contain the meta data

* flatten passinfo for interface

* retrigger ci

* remove required method

* make Pass python class lighter

* create pass -> decorator

* make the api consistent for all classes