TST: Reduce sensitivity on these tests.
TST: Reduce sensitivity on these tests.

This level of accuracy is not handled well on all platforms:

http://nipy.bic.berkeley.edu/builders/dipy-bdist32-27/builds/168/steps/shell_8/logs/stdio

demianw/dipy,jyeatman/dipy,villalonreina/dipy,JohnGriffiths/dipy,mdesco/dipy,jyeatman/dipy,sinkpoint/dipy,FrancoisRheaultUS/dipy,matthieudumont/dipy,mdesco/dipy,Messaoud-Boudjada/dipy,oesteban/dipy,StongeEtienne/dipy,JohnGriffiths/dipy,nilgoyyou/dipy,FrancoisRheaultUS/dipy,nilgoyyou/dipy,matthieudumont/dipy,StongeEtienne/dipy,beni55/dipy,demianw/dipy,rfdougherty/dipy,rfdougherty/dipy,villalonreina/dipy,beni55/dipy,sinkpoint/dipy,Messaoud-Boudjada/dipy,oesteban/dipy