Browsers have problem processing big revisions

When file revision is big browser have problems with processing it. It mostly affects IE, because this browser often crashes but reviews with such revisions doesn't work stable also on Firefox and Chrome.

Only available workaround for now is to split diffs on such revisions to smaller ones and to split reviews to review contained only one (bigger) revision.

Side-by-side diff makes things worse, there's twice much content to handle and IE crashes even faster.

Attachments contains files which may break IE on most machines.

It would be reasonable to add maximum file limit which can be handled in Crucible view.