Add script: /well [object] [(optional) reason]

Modified version of the /slap script. Handles reasons in natural language or passed as arguments.

Examples:
* `/well dgw for writing this script` → `/sme throws dgw down a well for writing this script`
* `/well dgw because he submits too many pull requests` → `/sme throws dgw down a well because he submits too many pull requests`
* `/well dgw his PRs are annoying` → `/sme throws dgw down a well: his PRs are annoying`

The two different ways of specifying the reason are due to feedback from other users I consulted while writing the script, as the two opinions were pretty equally represented.