Minor Updates

[StewPoll]

Redundant & symbol in URL.
Added formatting to the error message.

[llimllib]

The <url|text> format doesn't work for me:

[llimllib]

From the slack api docs:

If you want Slack to treat your message as completely unformatted, pass parse=full. This will ignore any markup formatting you added to your message.

We use that so that when plugins like !gif returns a plain URL it gets automatically linkified.

I guess I should add a method to the server that allows you to send a slack-formatted message? Would it be OK to just keep the full URL here for now?

Alternately, we could do something like the github plugin does

[llimllib]

Also, I've applied to the openweathermap team to have my key declared valid for the open source project so that we don't have to make people get a key, which would eliminate this problem.

[StewPoll]

Either would work.

In this instance having the API key declared valid for all would be the best for >this< plugin.

Having the option for formatted messages would be nice though