Heroku integration with foreman

Add foreman configuration for Heroku:
- To test production configuration execute NODE_ENV=production foreman
  start
- Database connection configuration now handles "use_env_variable" which
  should be defined as a environment variable such as "DATABASE_URL"
  with a proper database URI connection string, ie:
  postgres://user:password@db.example.com:5432/database
- Added package.json configuration to run migrations and db seed after
  `npm install`

Update frontend models to match sequelize definition.
Update views to work according to the changes above.
Handling isCompleted and parentId apropiately for PostgreSQL databases

public/javascripts/models/task.js

@@ -9,20 +9,20 @@ Backbone
   var TaskModel = Backbone.Model.extend({
 
     defaults: {
-      parent_id: '',
+      parentId: 0,
       content: '',
-      is_completed:'n'
+      isCompleted: 0
     },
 
     toggelCompletedStatus:function(isCompleted){
     	var prev_isCompleted = isCompleted,
     		self = this;
-    	this.save({'is_completed':isCompleted},
+    	this.save({'isCompleted':isCompleted},
     	{
     		success:function(){},
     		error:function(){
     			//REVERT BACK ON ERROR
-    			self.set({'is_completed':prev_isCompleted});
+    			self.set({'isCompleted':prev_isCompleted});
     		}
     	})
     }
@@ -31,4 +31,4 @@ Backbone
 
 return TaskModel;
 
-});
+});