Remove useless require (+ broken since my commit commit:0ae9639)
Fix various typos in issue_patch_spec
Refactor issue_patch_spec so things are clearer and examples more concise (still needs some work)
Add missing fixture which otherwise make tests fail if run alone

When running specs only, I had a clean database with no fixture loaded,
and not having "enabled_modules" in this test would make project having
no module hence not allowing viewing issues
(project.allows_to?(:view_issues) returning false)