[pycaffe] expose Net::CopyTrainedLayersFrom as Net.copy_from

This allows finetuning from Python, for example.
[pycaffe] expose Net::SharedTrainedLayersWith as Net.share_with
[fix] check solver prototxt parsing
use glog to provide a backtrace on crash
[cmake] move dependency finding to root CMakeLists.txt

In this way, custom include directories for the dependencies are
also available for tools/ and the bindings.  This is necessary for
example when someone is using custom built dependencies which are
not installed in the system's default directories (e.g. OpenCV includes
are required in tools/ through io.hpp)
Merge pull request #1232 from baeuml/cmake-move-dependency-discovery

[cmake] move dependency discovery to root CMakeLists.txt
Merge pull request #1226 from longjon/check-solver-prototxt

[fix] check solver prototxt parsing
Merge pull request #1227 from longjon/crash-backtrace

Use glog to provide a backtrace on crash
Fix CMake build of pycaffe
- generate right shared library name
- fix CMake linking with the new layer factory
- find numpy

Fix finding protobuf.
Merge pull request #1206 from BlGene/dev

Fix python plugin to work with new layer factory in CMake build
[example] fix data script paths for flickr fine-tuning
[example] add LeNet to MNIST title, fix paths to be from root
[example] re-title LeNet / MNIST heading too
[docs] update homebrew instructions for boost and boost-python split
[docs] note boost 1.56 an CUDA conflict on OS X
Merge pull request #1195 from longjon/python-copy-from

Expose Net.copy_from and Net.share_with in pycaffe
fix instantiation
Added Multistep, Poly and Sigmoid learning rate decay policies

Conflicts:
	include/caffe/solver.hpp
	src/caffe/proto/caffe.proto
	src/caffe/solver.cpp
adding missing libraries - lm and lstdc++
Merge pull request #1258 from Yangqing/instantiation

fix instantiation per C++ standard