Stash Post-Receive Webhook for Jenkins

After making commits to Stash, notify Jenkins that a new build has been created.

Requirements

Git Plugin - Jenkins needs to have the Git Plugin installed in Jenkins and the Poll SCM option must be enabled

Once installed, follow these steps:

Navigate to a repository in Stash.
Hit the Settings link
In the left-navigation, hit the Hooks link
For the Stash Post-Receive Webhook to Jenkins, click the Enable button.
Enter the URL to your Jenkins instance
Enter the URL to the Git repository, as it is configured in Jenkins for your project. If you're using ssh in Jenkins, use the SSH clone URL here. Otherwise, use the HTTP URL.
Submit the form.
Commit some code and watch it trigger a build!

Added an option to "Skip SSL Certificate Validation", allowing for plugin to communicate with Jenkins instance using a self-signed cert (setting is on Hooks settings for each project)
Handle Jenkins urls with trailing slashes more gracefully (thanks ellingbo)