* code was only ever removing the first event listener from each element
on unload cache (for loop instead of while)
* code was frequently not removing observers because their associated
elements have already been removed
These two are fixed by this patch. Combined with the previous commits to
setting events, this should fix the memory leaks demonstrated by the 'drip'
tool for IE.
git-svn-id: http://svn.openlayers.org/trunk/openlayers@2913 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
a07a4c309d