WIP: Adding PipelineHooks

brequested to merge
noyez/rust-gitlab:noyez_add_pipeline_web_hook into master

Code to accept pipeline webhook calls.

Most code is new except I modified ProjectHookAttrs to make the last 4 attributes as Option. With that modification cargo test still succeeded. I also added a state of Passed to StatusState.

Edited by Ben Boeckel

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