define gradient at zero to be zero
Merge pull request #1326 from jackculpepper/absgradatzero

[fix] define gradient at zero to be zero to fix ABSVAL NaN
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 remote-tracking branch 'upstream/dev' into dev