A few users have complained about how hard it is to find the
Trello script on their systems after installing the `zulip`
package. Rishi and I decided that we should instead just ask
the users to download the script directly and run it without
having to install the `zulip` package.
This commit also ensures that the script can be run on both
py2 and py3.
The information logged to the CSV file is largely redundant, since
the ID of the webhook is already printed to the screen once a
webhook is setup correctly.
Since this is a script that the user is required to run
once, we should minimize its reliance on external files as much
as possible. This makes it easier to run the script when one
is SSH-ing into a server and doesn't really care about where
the script lives, for instance.
A few users have complained about how hard it is to find the
Trello script on their systems after installing the `zulip`
package. One way to solve this issue is to make the Trello
script a part of the exported console scripts in the zulip
package, which would mean that the user would not have to
navigate to a particular directory in order to find the script,
but could run it from a terminal directly.
However, to make this happen, we need to minimize the script's
reliance on external configuration files, because we don't want
the user to have to figure out where the config file lives.
This commit makes a bunch of improvements:
1. Use format() for string formatting instead of the old style.
2. Stop returning stuff where we don't have to.
3. URL generation should not be done by the script, especially
since our eventual goal is for the Zulip server to automatically
generate a webhook URL. So the user should be able to supply
the URL in the config file. Plus, this makes it easier to test
the script with non-Zulip URLs (such as RequestBin).
4. Removed unnecessary arguments.
