Badges were leaked to unauthorized users even when Public Builds
project setting is disabled.
Added guard clause to the controller to check if user can read
build.
Updates specs to use new rails5 format.
The old format:
`get :show, { some: params }, { some: headers }`
The new format:
`get :show, params: { some: params }, headers: { some: headers }`
First commit in probably 2, for resolvegitlab-org/gitlab-ce#15582. This
commit is renaming files and classes from build to pipeline. Also
wording is editted to pipeline. Given `pipeline` had more characters
than `build`, I've made the field a bit wider. The width now matchers
the one for the coverage badge, so they look nice when in a table
format, or in a list.
As soon as this commit is merged to master, and released, the build.svg
is deprecated, meaning that all users which already placed a badge
should update it. However, to make sure it keeps working tests are added
for this case.