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
Refactored leveldb and lmdb code.
Some tool updates that I forgot.
Some cleanup to make travis happy.
Updated interface to make fewer string copies.
Don't autocommit on close for the databases.  If they were read-only, then they might fail.
data layer test was relying on the autocommit on close db behavior that was recently removed.
Updated cifar10 build script to specify db backend.
Switched create_cifar10.sh output from leveldb to lmdb.