Update ProjectInvite model

services/web/app/coffee/models/ProjectInvite.coffee

@@ -4,15 +4,21 @@ Settings = require 'settings-sharelatex'
 Schema = mongoose.Schema
 ObjectId = Schema.ObjectId
 
+THIRTY_DAYS_IN_SECONDS = 60 * 60 * 24 * 30
+
+makeExpirationDate = () ->
+	nowInMillis = Date.now()
+	new Date(nowInMillis + (1000 * THIRTY_DAYS_IN_SECONDS))
+
+
 ProjectInviteSchema = new Schema
-	project_id:     ObjectId
-	from_user_id:   ObjectId
-	privilegeLevel: String
-	# For existing users
-	to_user_id:     ObjectId
-	# For non-existant users
-	hashed_token:   String
 	email:          String
+	token:          String
+	sendingUserId:  ObjectId
+	projectId:      ObjectId
+	privileges:     String
+	createdAt:      {type: Date, default: Date.now}
+	expiresAt:      {type: Date, default: makeExpirationDate}
 
 conn = mongoose.createConnection(Settings.mongo.url, server: poolSize: Settings.mongo.poolSize || 10)
 
@@ -20,4 +26,4 @@ ProjectInvite = conn.model('ProjectInvite', ProjectInviteSchema)
 
 mongoose.model 'ProjectInvite', ProjectInviteSchema
 exports.ProjectInvite = ProjectInvite
-exports.ProjectInviteSchema = ProjectInviteSchema
+exports.ProjectInviteSchema = ProjectInviteSchema