homepage

Suggestions:
* new name: assertCountEqual(a, b)
 or: assertElementCountEqual(a, b)
 this name captures the essential service:
 - unordered comparison where duplicates matter
 - inputs are "elements", 
 not "items" which means key/value pairs
* O(n) implementation with O(n**2) fallback:
 try:
 a_cnt = collections.Counter(a)
 b_cnt = collections.Counter(b)
 except TypeError:
 # do current O(n**2) fallback
 else:
 if a_cnt == b_cnt:
 # test passed
 else:
 in_a_but_not_in_b = a - b
 in_b_but_not_in_a = b - a
 # display nice diff
* documentation should emphasize the new name:
 assertElementCountEqual(a, b)
 obsolete alias: assertItemsEqual(a, b)