Fix 'make lint' in OSX

[jeffdonahue]

Thanks to @sguada for reporting in the comment thread on #132:

Seems that NONGEN_CXX_SRCS (Makefile variable intended to list all the files we want to include in lint) was empty in OSX due to some disagreement in the regex formatting of 'find'...give up on that and use an ugly but (hopefully?) reliable chain of -name ... -or -name ...

[shelhamer]

Good find @sguada and thanks for the fix @jeffdonahue.

[sguada]

Thanks @jeffdonahue now it works in OSX but now it detects some problems in several files currently in dev

src/caffe/layers/bnll_layer.cpp:5:  Found C++ system header after other header. Should be: bnll_layer.h, c system, c++ system, other.  [build/include_order] [4]
src/caffe/layers/bnll_layer.cpp:29:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
src/caffe/layers/dropout_layer.cpp:45:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
src/caffe/layers/relu_layer.cpp:5:  Found C++ system header after other header. Should be: relu_layer.h, c system, c++ system, other.  [build/include_order] [4]
src/caffe/layers/relu_layer.cpp:25:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
src/caffe/layers/sigmoid_layer.cpp:5:  Found C++ system header after other header. Should be: sigmoid_layer.h, c system, c++ system, other.  [build/include_order] [4]
src/caffe/layers/sigmoid_layer.cpp:6:  Found C++ system header after other header. Should be: sigmoid_layer.h, c system, c++ system, other.  [build/include_order] [4]
src/caffe/layers/sigmoid_layer.cpp:29:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
src/caffe/layers/softmax_layer.cpp:41:  Add #include <algorithm> for max  [build/include_what_you_use] [4]
src/caffe/layers/softmax_layer.cpp:61:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
src/caffe/layers/softmax_loss_layer.cpp:48:  Lines should be <= 80 characters long  [whitespace/line_length] [2]

I will not try to fix those in my PR otherwise they will get mixed