Replace ceil_mode with round_mode

[keerthanss]

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The param ceil_mode was proposed in https://github.com/BVLC/caffe/pull/3057 , but never merged. Its replacement, https://github.com/BVLC/caffe/pull/6282 , fulfills the same need with some syntactic variance. The param is now called "round_mode" and it is an enum, instead of a boolean. This commit modifies the files accordingly.

This will allow usage of the models without having to modify Caffe code, addressing https://github.com/shicai/DenseNet-Caffe/issues/1, https://github.com/shicai/DenseNet-Caffe/issues/6, as well as averting issues like https://github.com/shicai/DenseNet-Caffe/issues/15.

[mrgransky]

Getting an error with both ceil_mode: false and round_mode:FLOOR for caffe-gpu installed via anaconda, as explained #37.