Remove old implementation of collection filtering

As part of the prep work for 2.4.0, we're removing the filter
properties used on collections as we prepare a different implementation.
Unfortunately, this has to be removed to prevent conflicting APIs
and for performance.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Update DataRepeater sample to use index property

We didn't have samples that showed the use of the index property to
get the item number, so I've updated DataRepeaterSampler to have
an index at the start of each line.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #680 from enyojs/add-index-to-repeater

Update DataRepeater sample to use index property

LGTM

Reviewed-By: Cole Davis (cole.davis@lge.com)
Merge pull request #676 from enyojs/remove-collection-filters

Remove old implementation of collection filtering

This is sufficient for now until the replacement is ready.

Reviewed-By: Cole Davis (cole.davis@lge.com)