GF-9854-ListPulldownSampleUpdated

The pulldown list is not appearing in the sample.
The Sample was using twitter open API earlier, which is closed now.
So the API is replaced with the flickr API that's been used in other
list samples.

Enyo-DCO-1.1-Signed-off-by: Rajyavardhan P <rajyavardhan.p@lge.com>
Merge remote-tracking branch 'origin/master' into GF-9854-rajyavardhanp
GF-9854-Sample Updated

ListPulldownSample is updated according to the given comments,  works
for the platforms with no jsonp support.

Enyo-DCO-1.1-Signed-off-by: Rajyavardhan P <rajyavardhan.p@lge.com>
Merge pull request #56 from enyojs/GF-9854-rajyavardhanp

GF-9854-ListPulldownSampleUpdated

Reviewed-By: Ben Combee (ben.combee@lge.com)