Path escape project name on missing Pipelines API methods
Path escape project name on missing Pipelines API methods

These methods were requiring the ids to be numerical, while the rest of
the Pipelines API methods allowed for "group/project" string kind of id.
Now all API is consisteng.

Signed-off-by: Lluis Campos <9244cb41c39addfc5cf236920b776ea2820513d0@northern.tech>

xanzy/go-gitlab