Add unit tests for Table.round()
Add unit tests for Table.round()

saimn/astropy,dhomeier/astropy,astropy/astropy,mhvk/astropy,dhomeier/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,astropy/astropy,lpsinger/astropy,saimn/astropy,aleksandr-bakanov/astropy,pllim/astropy,lpsinger/astropy,mhvk/astropy,pllim/astropy,astropy/astropy,larrybradley/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,astropy/astropy,dhomeier/astropy,saimn/astropy,lpsinger/astropy,mhvk/astropy,saimn/astropy,pllim/astropy,pllim/astropy,dhomeier/astropy,pllim/astropy,astropy/astropy,lpsinger/astropy,dhomeier/astropy,larrybradley/astropy,lpsinger/astropy,mhvk/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,mhvk/astropy,saimn/astropy,StuartLittlefair/astropy