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.
#130 - Fix environment edit buttons.

* Also, new spec written for show.html.erb of environments.
#130 - Fix environment variable add.

* Was broken due to ERB change between Rails versions. Needed to use <%= instead of <%-.
Merge pull request #370 from arvindsv/fix_add_environments

Fix environments edit page
Merge pull request #369 from arvindsv/fix_trigger_with_options_material_popup

Fix trigger with options material popup
acceptance fixes
Merge pull request #374 from srinivasupadhya/master

acceptance fixes
blocking_link_to_remote_new requires 'html' option
#130 added pipeline admin and pipeline layout specs to new rails
#130 fixed pipeline admin and pipeline layout specs for new rails
#130 using correct blocking_link_to_remote
Merge pull request #377 from pshivana/master

migrated pipeline admin and pipeline layout specs to new rails
#130 - Fix POST => GET for old Rails.
Merge pull request #378 from arvindsv/fix_trigger_with_options_material_popup

#130 - Fix POST => GET for old Rails.
acceptance fixes: handling changed check_box behavior
Merge pull request #379 from srinivasupadhya/master

acceptance fixes: handling changed check_box behavior
acceptance fixes: fixing html escape