GitLab

* Add tests for NMS

* Fix linting errors

* Add DeviceGaurd to nms_cuda

* add isort config

* use isort to sort imports

* add isort to travis

* Implement all extension building in main setup.py

* Remove old build files

* Adapt installation guide

* Refactor to comply with flake8

* Move imports into functions & refactor module paths

* Format setup.py with yapf

* Move cython/numpy import back to head of file

* Add note to use verbose mode for pip in INSTALL.md

* port nms extension from maskrcnn-benchmark

* fix linting error

Fix bug for gpu_nms.

Fix bug for nms_wrapper.