TST: Added unit tests for assert_array_less
TST: Added unit tests for assert_array_less

Added tests for simple arrays/elements,
tests that ensure that nans are not compared when they are in the same
position in both arrays but raise AssertionError when they are not,
and tests that ensure inf logic
(-np.inf < np.inf, 1.0 < np.inf, -np.inf < 1.0)
and that all other cases fail.

utke1/numpy,bringingheavendown/numpy,endolith/numpy,pizzathief/numpy,anntzer/numpy,jorisvandenbossche/numpy,behzadnouri/numpy,chatcannon/numpy,abalkin/numpy,gfyoung/numpy,charris/numpy,jakirkham/numpy,ahaldane/numpy,shoyer/numpy,jorisvandenbossche/numpy,solarjoe/numpy,b-carter/numpy,solarjoe/numpy,jorisvandenbossche/numpy,grlee77/numpy,pbrod/numpy,WarrenWeckesser/numpy,chatcannon/numpy,anntzer/numpy,chatcannon/numpy,Eric89GXL/numpy,tynn/numpy,pbrod/numpy,mattip/numpy,ahaldane/numpy,abalkin/numpy,rgommers/numpy,Eric89GXL/numpy,WarrenWeckesser/numpy,WarrenWeckesser/numpy,grlee77/numpy,madphysicist/numpy,pdebuyl/numpy,numpy/numpy,pizzathief/numpy,pizzathief/numpy,charris/numpy,endolith/numpy,shoyer/numpy,abalkin/numpy,MSeifert04/numpy,mattip/numpy,jakirkham/numpy,shoyer/numpy,endolith/numpy,pizzathief/numpy,ContinuumIO/numpy,tynn/numpy,simongibbons/numpy,jakirkham/numpy,pbrod/numpy,bringingheavendown/numpy,mattip/numpy,anntzer/numpy,solarjoe/numpy,MSeifert04/numpy,Eric89GXL/numpy,ContinuumIO/numpy,WarrenWeckesser/numpy,mhvk/numpy,numpy/numpy,pbrod/numpy,charris/numpy,numpy/numpy,pbrod/numpy,tynn/numpy,rgommers/numpy,simongibbons/numpy,mhvk/numpy,seberg/numpy,behzadnouri/numpy,seberg/numpy,bringingheavendown/numpy,pdebuyl/numpy,utke1/numpy,shoyer/numpy,endolith/numpy,jorisvandenbossche/numpy,gfyoung/numpy,charris/numpy,ahaldane/numpy,bertrand-l/numpy,b-carter/numpy,mattip/numpy,rgommers/numpy,WarrenWeckesser/numpy,madphysicist/numpy,pdebuyl/numpy,behzadnouri/numpy,grlee77/numpy,ssanderson/numpy,grlee77/numpy,ssanderson/numpy,grlee77/numpy,Eric89GXL/numpy,anntzer/numpy,rgommers/numpy,jakirkham/numpy,ContinuumIO/numpy,simongibbons/numpy,bertrand-l/numpy,pdebuyl/numpy,jakirkham/numpy,shoyer/numpy,mhvk/numpy,madphysicist/numpy,ahaldane/numpy,simongibbons/numpy,MSeifert04/numpy,gfyoung/numpy,ssanderson/numpy,pizzathief/numpy,mhvk/numpy,madphysicist/numpy,numpy/numpy,seberg/numpy,bertrand-l/numpy,utke1/numpy,madphysicist/numpy,b-carter/numpy,MSeifert04/numpy,simongibbons/numpy,ahaldane/numpy,jorisvandenbossche/numpy,seberg/numpy,MSeifert04/numpy,mhvk/numpy