Add default options, a filter around the get_post_meta, and ability to set label visibility on a field level

White space cleanup

Line 180 & 189:
	Allow parameter for each field to set "show_names" to false (as opposed to only being able to set meta_box "show_names").

line 189:
	add ability to filter/modify data before running it through the metabox fields.

lines 306-307:
	Allow a default for the 'taxonomy select' type.

lines 322-323:
	Allow a default for the 'taxonomy radio' type.