fix instantiation
adding missing libraries - lm and lstdc++
Merge pull request #1258 from Yangqing/instantiation

fix instantiation per C++ standard
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.
Added encoded option and check_size to convert_imageset

Conflicts:
	tools/convert_imageset.cpp
Added encoded datum to io
Added test for encoded Datum to test_io.cpp
Added timers for benchmarking
Add fast code for transform(cv::Mat,Blob)
Add root_folder to ImageDataLayer
Added TIMING flag to Makefile for timing forward, backward and prefetch
Make Lint happy
Speed up WindowDataLayer and add mean_values
Added cache_images to WindowDataLayer
Added root_folder to WindowDataLayer to locate images
Remove TIMING flag, change caffe time to do forward/backward and accumulate time per layer