added assertion that seconds bounds for chunker are positive.
add stop_watch_time meth
include defaults for plotting.
changed kwds, now 'image_name' and 'image_type'
added digital train interval meth
reader writes, add method to change file start time in header.
color kwd for script abf plot, add write out header for abf_reader method
added header write out method to abf_reader
fixed episode number bug, now only will read num episodes recorded.
Merge branch 'waveform' into indxs

Conflicts:
	abf_reader.py
add back abf_reader after merge wtf am I doing?
added back correct abf_reader, fuck you git merge.
two new iterator objects for conv plotting of episodice abfs