Full support for project pipeline(s) endpoints

[ghost]

Hi there,
We needed the GET and the POST pipeline API end-points which I introduced as show and create - i.e. following what I could understand of the library standard.

References:

• https://github.com/gitlabhq/gitlabhq/blob/master/doc/api/pipelines.md#get-a-single-pipeline
• https://github.com/gitlabhq/gitlabhq/blob/master/doc/api/pipelines.md#create-a-new-pipeline

Thank you,

[ghost]

FYI, to be "feature-complete" it would miss retry and cancel end-points.

[ghost]

I've completed project pipeline(s) support, even if I don't need it right now. I manually tested it and it works.

References:

• https://github.com/gitlabhq/gitlabhq/blob/master/doc/api/pipelines.md#retry-jobs-in-a-pipeline
• https://github.com/gitlabhq/gitlabhq/blob/master/doc/api/pipelines.md#cancel-a-pipelines-jobs

[jdalrymple]

Perfect!! Will release in the next day or so!