force mxnet>=1.3.0, replace load_params with load_parameters (dmlc#398)

* force mxnet>=1.3.0, replace load_params with load_parameters

* fix pylint

Add static alloc and fix load/save_params (dmlc#183)

* fix save_params

* add warmup lr

* add static alloc

* tune coco settings

* fix load_params

* add logging to saving parameters

* tune coco param num_sample, test_post_nms

* fix params doc

* add coco settings to eval

* change coco to 2x lr schedule

* fix load_params in eval, pretrained backbone is still unchanged

update url and test oom (dmlc#79)

* rename param suggested by Tong

* pylint

* update url