change step to reflect element visibility

So the cucumber step 'And I follow "link title"' does substring matching, and will click on the first link it finds that contains "link title". Thus if you have 2 aspects, one called PostingTo and the other called NotPostingTo, doing 'And I follow "PostingTo"' may click a different link depending on what order the aspect links are in.
ka-sigh.

Remove more ordering assumptions - this time in the ordering of aspects in the dropdown. Are we there yet?

Cucumber/spec cleanup. Removed some stray aspect.firsts, which should improve reliability across databases. Removed some cucumber steps we don't use & consolidated duplicate steps.

Make connecting users in cucumber more deterministic. Should cut down on spurious failures in comment spec.

Make posts.feature a little more reliable. The Scenario Outlines were sitting on the profile page as the background ran which may have been contributing to the System Exit problem.