Remove `features.mendeley` and `features.zotero` from User model

services/web/app/coffee/models/User.coffee

@@ -36,8 +36,6 @@ UserSchema = new Schema
 							compileGroup:  { type:String,  default: Settings.defaultFeatures.compileGroup }
 							templates:     { type:Boolean, default: Settings.defaultFeatures.templates }
 							references:    { type:Boolean, default: Settings.defaultFeatures.references }
-							mendeley:    { type:Boolean, default: Settings.defaultFeatures.mendeley }
-							zotero:    { type:Boolean, default: Settings.defaultFeatures.zotero }
 						}
 	featureSwitches	  : {
 		pdfng: { type: Boolean }