Update to add formatting option when outputting field in template.

Updated to use EE's global config var, 'path_third_themes'.
New feature: format options. Directly maps to PHP's number_format function.
Params:
	decimals, 	eg. '3' = 123.456
	dec_point, 	eg. '.' = 123.45
	thousands_sep,	eg. ',' = 123,456.78

t branch -m HEAD newbranch#