Fixed ambigious cucumber match of login steps
Changed "click on" step to only click on visible elements to prevent
ambigious capybara matches
Removed call to non-existent function formerly removing a line from
a table as the following modify of an existing attribute with the
already-existing line from the table should not cause problems as
long as it is not a key attribute
Added check to not add already existing trackers in case some previous setup
step already added the same tracker
Merge pull request #179 from opf/feature/rails3_fix_reporting_cukes

[OPF #764,765] Feature/rails3 fix reporting cukes