Remove circuit djangoapp from LMS

These endpoints (`edit_circuit` and `save_circuit`) had already been
commented out of `urls.py`, so these views were disabled.

lms/djangoapps/circuit/models.py

-from django.db import models
-
-
-class ServerCircuit(models.Model):
-    # Later, add owner, who can edit, part of what app, etc.
-    name = models.CharField(max_length=32, unique=True, db_index=True)
-    schematic = models.TextField(blank=True)
-
-    def __unicode__(self):
-        return self.name + ":" + self.schematic[:8]

lms/djangoapps/circuit/views.py

-import json
-
-import xml.etree.ElementTree
-
-from django.http import Http404
-from django.http import HttpResponse
-from edxmako.shortcuts import render_to_response
-
-from .models import ServerCircuit
-
-
-def circuit_line(circuit):
-    ''' Returns string for an appropriate input element for a circuit.
-        TODO: Rename. '''
-    if not circuit.isalnum():
-        raise Http404()
-    try:
-        sc = ServerCircuit.objects.get(name=circuit)
-        schematic = sc.schematic
-    except:
-        schematic = ''
-
-    circuit_line = xml.etree.ElementTree.Element('input')
-    circuit_line.set('type', 'hidden')
-    circuit_line.set('class', 'schematic')
-    circuit_line.set('width', '640')
-    circuit_line.set('height', '480')
-    circuit_line.set('name', 'schematic')
-    circuit_line.set('id', 'schematic_' + circuit)
-    circuit_line.set('value', schematic)  # We do it this way for security -- guarantees users cannot put funny stuff in schematic.
-    return xml.etree.ElementTree.tostring(circuit_line)
-
-
-def edit_circuit(_request, circuit):
-    try:
-        sc = ServerCircuit.objects.get(name=circuit)
-    except:
-        sc = None
-
-    if not circuit.isalnum():
-        raise Http404()
-    response = render_to_response('edit_circuit.html', {'name': circuit,
-                                                        'circuit_line': circuit_line(circuit)})
-    response['Cache-Control'] = 'no-cache'
-    return response
-
-
-def save_circuit(request, circuit):
-    if not circuit.isalnum():
-        raise Http404()
-    print dict(request.POST)
-    schematic = request.POST['schematic']
-    print schematic
-    try:
-        sc = ServerCircuit.objects.get(name=circuit)
-    except:
-        sc = ServerCircuit()
-        sc.name = circuit
-    sc.schematic = schematic
-    print ":", sc.schematic
-    sc.save()
-    json_str = json.dumps({'results': 'success'})
-    response = HttpResponse(json_str, mimetype='application/json')
-    response['Cache-Control'] = 'no-cache'
-    return response

lms/envs/common.py

@@ -1819,7 +1819,6 @@ INSTALLED_APPS = (
     'openedx.core.djangoapps.theming',
 
     # Our courseware
-    'circuit',
     'courseware',
     'student',
 

lms/static/coffee/src/main.coffee

@@ -18,15 +18,6 @@ $ ->
   if $('body').hasClass('courseware')
     Courseware.start()
 
-  # Preserved for backward compatibility
-  window.submit_circuit = (circuit_id) ->
-    $("input.schematic").each (index, el) ->
-      el.schematic.update_value()
-
-    schematic_value $("#schematic_#{circuit_id}").attr("value")
-    $.postWithPrefix "/save_circuit/#{circuit_id}", schematic: schematic_value, (data) ->
-      alert('Saved') if data.results == 'success'
-
   window.postJSON = (url, data, callback) ->
     $.postWithPrefix url, data, callback
 

lms/templates/edit_circuit.html

-<div align="center">
-<form onsubmit="return submit_circuit('${name}');" action="" method="post"> 
-<!--input type="hidden" class="schematic" width="600" height="400" name="schematic" value="" /-->
-${ circuit_line }
-<input type="submit" value="save">
-<input type="hidden" name="csrfmiddlewaretoken" id="csrfmiddlewaretoken">
-</form>
-</div>

lms/urls.py

@@ -331,10 +331,6 @@ if settings.COURSEWARE_ENABLED:
 
         # TODO: These views need to be updated before they work
         url(r'^calculate$', 'util.views.calculate'),
-        # TODO: We should probably remove the circuit package. I believe it was only used in the old way of saving wiki
-        # circuits for the wiki
-        # url(r'^edit_circuit/(?P<circuit>[^/]*)$', 'circuit.views.edit_circuit'),
-        # url(r'^save_circuit/(?P<circuit>[^/]*)$', 'circuit.views.save_circuit'),
 
         url(r'^courses/?$', 'branding.views.courses', name="courses"),
         url(r'^change_enrollment$',