Added enios dirthreshold command, patch from http://www.proxmark.org/forum/viewtopic.php?pid=11577#p11577
THIS REQUIRES A BOOTROM UPDATE!! To save FPGA area, split the LF and HF bitstreams and load them on-demand.
armsrc/fpgaloader.c: forgot the copyright notice
fpga/fpga_hf.v, fpga_lf.v, lo_edge_detect.v, lo_passthru.v, lo_read.v: copyright notice
new command "lf snoop" to snoop raw ADC values

fpga/lo_read.v (lf_field): new argument.
fpga/fpga_lf.v: modify accordingly.

armsrc/apps.h (FPGA_MAJOR_MODE_LF_READER): Rename as FPGA_MAJOR_MODE_LF_ADC.
armsrc/apps.h (FPGA_LF_ADC_READER_FIELD): New LF option.
armsrc/lfops.c: Modify accordingly.

client/cmdlf.c (CmdLFSnoop): New command.
armsrc/appmain.c, armsrc/lfops.c, client/cmdlf.h, include/usb_cmd.h: Modify accordingly.
Keep the PM3 code repo clean of website/wiki stuff.
Merged with master