[fix] check solver prototxt parsing
Merge pull request #1226 from longjon/check-solver-prototxt

[fix] check solver prototxt parsing
[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