`data-exclude-edition` requires a fragment identifier

[peterstadler]

The current Readme states that the data-exclude-edition takes the xml:id of the edition:

csLink/README.md

Lines 110 to 111 in c131124

	data-exclude-edition
	`xml:id` of the edition to be excluded from search. Multiple ids separated by comma.

Yet, I needed to prefix the xml:id with a # to make it work. While it's probably easier to fix the documentation, I think it makes more sense to fix the processing to match the substring.

[StefanDumont]

Thanks, Peter, for this issue! I agree that we should fix this in the next release (the processing, not the doc)!