Fixed a bug with the data-ex-collection-id attribute.
Exhibit's default mapping of the (camelCase) collectionID parameter to html
was seeking an html attribute called data-ex-collection-i-d .
So I added a hack that specifically looks for parameters ending in
(capital) ID and looks for the -id conversion of the parameter.
Merge pull request #116 from karger/2014-12-16_id_attribute

Fixed a bug with the data-ex-collection-id attribute.