mostly-disabled gpu allocation trace printouts.

can be enable with -DENABLE_ALLOC_TRACE when building caffe.
matcaffe: init google logging with "matcaffe" as name
makefile: remove unneeded -UNDEBUG, add commented -DENABLE_ALLOC_TRACE example cflags
Merge branch 'featpyramid' of https://github.com/forresti/caffe into featpyramid