setSummary now takes a hash of parameters.

Amongst these new parameters is 'rawSummary' that enables html in the summaries, and 'handler' that allows modifications/bindings on the summary.

LineMessageView.getSummary modified to use these new options to bind the line-number to the 'goToLine'-method.
Merge pull request #5 from fangel/issues/5-clickable-lineno

foldmode "line errors" is now clickable