CLN: Specialize assert_(np.array_equal(...))
Work on #6175. This is the third (and final) "half" of the work started in #6368.

Sorry for the inefficiency. I had unknowingly changed working directories, so my grep-fu failed me. Now, from pandas/, the following returns no instances of assert_(np.array_equal(...)), so the work started in #6368 is now completed:

grep -nH --recursive -e 'assert_(np.array_equal' .
 Investigating the Travis issue; tests had passed locally.
 @bwignall that error happens very ocassionaly.....this is fine

thanks!

lmk when you want to close that issue?
 Thanks, @jreback. There's still some work to do to get that issue wrapped up, but most of what remains should be pretty straightforward.
