Modification of the plotDay function

More option are now available:
x_labels_size
y_labels_size
title_size
line_width
subplots_adjust_left
subplots_adjust_right
subplots_adjust_top
subplots_adjust_bottom
tick_format
right_vertical_labels
one_tick_per_line
show_y_UTC_label
title
Update waveform.py
add line_width parameter
Update stream.py

documentation for more options for plot and dayplot
Merge branch 'plotday'

Conflicts:
	obspy/core/stream.py