Better argument handler on project task_details - config.prompt_me_for_i...

hi,

Got a missing if on the for task_details.
Now it's working as intended the task arguments.
(I don't need to use task arguments now, just a normal one.)
Example:

![image](https://cloud.githubusercontent.com/assets/682902/4253571/e3b113e0-3aa1-11e4-997c-471eef0b23f4.png)


![image](https://cloud.githubusercontent.com/assets/682902/4253581/0c1c7216-3aa2-11e4-8a84-10ad4d64c1be.png)

This is the piece of code:

        for arg in task_details[2]:
            if isinstance(arg, tuple):
                name, default = arg
            else:
                name, default = arg, None

            if name in used_arg_names:
                continue

            str_config_key = 'configuration_value_for_{}'.format(name)

            #if not config.prompt_me_for_input:
            #    if config.task_argument:
            #        used_arg_names.append(config.key)
            #    continue

            field = CharField(label='Argument value for ' + name, initial=default)

            form.fields[str_config_key] = field
            form.helper.layout.fields.insert(len(form.helper.layout.fields)-1, str_config_key)