Minor fixes.  (1) cudnn.hpp uses CHECK_EQ internally, so it needs to include glog at some point.  Including caffe/common.hpp.  (2) I often misconfigure some layer and softmax breaks when the dimensionality is too small for the input layers.  Check and fail fast.  (3) CV_LOAD_IMAGE_COLOR is deprecated and has been removed in OpenCV 3.0.  Replaced with cv::IMREAD_COLOR.
OpenCV should be compiled using pkg-config options.
Added version dependent test for IMREAD_COLOR.
Fixed CMakeList to work with OpenCV 3.
Merge pull request #1261 from kmatzen/minor_changes

[fix] build with OpenCV 3 and other minor fixes
fix flaky test EXPECT_EQ code, using EXPECT_FLOAT_NEAR per Jeff
fix flaky math functions, remove unnecessary instantiations.
Merge pull request #1264 from Yangqing/dev

Clean flaky code
some namespace simplification
Merge pull request #1269 from Yangqing/dev

Minor change: some namespace simplification
move registration code to corresponding cpp files.
Merge pull request #1270 from Yangqing/dev

Give back to layer what is layer's, and to factory what is factory's
Merge branch 'dev' of https://github.com/BVLC/caffe into reshape_layer_2

Conflicts:
	src/caffe/layer_factory.cpp
Added REGISTER_LAYER_CLASS to reshape_layer.cpp.