Revert "#130 - Fix 'trigger with options' material search."

This reverts commit 42445f5a77110fdb1d25808923f0877f37afed73.

Will fix by converting the POST to a GET, instead. It's possible.
#130 - Change POST to GET for material_search.

* This is the call used by the material search box in trigger with options.
  It used to do a POST. Now, it has been changed to do a GET.

* Still allowing a POST to it as well, like earlier. Might need to check
  and remove later.
#130 - Do not use layout with material_search call.

* Was trying to use a layout (pipelines layout) and failing.
#130 - Remove ability to POST to /pipelines/material_search.
Merge pull request #369 from arvindsv/fix_trigger_with_options_material_popup

Fix trigger with options material popup