Update data_transformer.hpp

Minor grammar fix in comments.
groom ignore

- re-group general and Caffe ignores
- ignore OS X files and Eclipse .settings as suggested by @cypof
make release, debug build dirs configurable in Makefile
Minor whitespace fix in logging message in HDF5 output layer
Merge pull request #1344 from baeuml/minor-whitespace-in-logging-message-fix

Minor whitespace fix in logging message in HDF5 output layer
merge
Some debugging info for when a label is not properly defined.
Fixed some CHECKs in protobuf layer.
Added the ability to shift by mean and scale by stdev to protobuf data layer labels.
Memory reclaim
More error handling for protobuf layer.