change hard-coded relative caffe dev/home path from caffe_3 -> caffe_dev
img_io: pel ctor, pel get/set funcs
boda_base: add nda_reduce() (really currently accumulate i guess), min/max functors
conv_pyra: testing/skeleton for moving data from boda<->caffe
blf_pack: create blf_pack.H, expose some functionality there
blf_pack: make iface more/actually usable
img_io: add task for save_fn_png
timers: tot_dur should totally be uint64_t. oops. summary total duration times >4s might be right now.
conv_pyra: start using img_pyra_pack. note that paramter passing to the nested operations is incomplete/stubbed.