ClassIndexWebElementIdentifier and TagIndexWebElementIdentifier don't really work as intended

[GoogleCodeExporter]

Currently these are still using the global index into ALL elements with the 
stored basis. The way we want them to work is to have a modified index which is 
the index into JUST the elements with the given classname / tag. So if there 
are 5 <buttons>, the possible values in the stored index value would be 0..4.

Original issue reported on code.google.com by smcmas...@google.com on 30 Nov 2012 at 10:50