whitespace fixes for issues edit partials
added cukes for issue#new and issue#edit

- checking for attributes which are overridden by childs
- new step to find disabled elements
shortened condition in issues helper
fixed typo in issue new cuke
fixed some typos for disabled issue attributes
Merge pull request #189 from opf/feature/rails3_fix_disabled_fields_on_issue_new

Feature/rails3 fix disabled fields on issue new