changes dontfall.ino to the mx2125 sample code
added buzzer pin and started work on output function
adds signal processing routines
pulls chris's work and fixes merge conflicts
build verified
fixed bug with Serial issues - reduced MAX_SAMPLE_BUF_LEN to 127
fixes stupid error in sig proc routine
fixed buffer_len issue and changed buzzer_pin to 13
removes square and sqrt
un-commented sig_proc_init
adds to readme