Add extra fetch_first test for right-side-only order
Add explicit AS keyword to RowNum (Oracle) limit dialect

This should have no effect on the actual query, only done to bring in line
with the generalized DQ engine
Minimal optimization of the new+prefetch codepath (no func. changes)
Reduce Travis' stamina

http://blog.travis-ci.com/2013-11-27-fast-finishing-builds/
Throwaway