Added unit tests for fftconvolve()
Added unit tests for fftconvolve()

hshindo/arrayfire,9prady9/arrayfire,HolyGeneralK/arrayfire,pentschev/arrayfire,unbornchikken/arrayfire,mrgloom/arrayfire,bkloppenborg/arrayfire,jramapuram/arrayfire,victorv/arrayfire,Keno/arrayfire,victorv/arrayfire,bkloppenborg/arrayfire,ghisvail/arrayfire,pentschev/arrayfire,mrgloom/arrayfire,arrayfire/arrayfire,linan7788626/arrayfire,munnybearz/arrayfire,hshindo/arrayfire,shehzan10/arrayfire,bkloppenborg/arrayfire,9prady9/arrayfire,victorv/arrayfire,umar456/arrayfire,marbre/arrayfire,mrgloom/arrayfire,linan7788626/arrayfire,jramapuram/arrayfire,pombredanne/arrayfire,hshindo/arrayfire,pombredanne/arrayfire,munnybearz/arrayfire,jramapuram/arrayfire,asifmadnan/arrayfire,hshindo/arrayfire,merlin-ext/arrayfire,HolyGeneralK/arrayfire,arrayfire/arrayfire,umar456/arrayfire,arrayfire/arrayfire,arrayfire/arrayfire,merlin-ext/arrayfire,merlin-ext/arrayfire,pentschev/arrayfire,HolyGeneralK/arrayfire,linan7788626/arrayfire,victorv/arrayfire,unbornchikken/arrayfire,merlin-ext/arrayfire,shehzan10/arrayfire,mrgloom/arrayfire,shehzan10/arrayfire,HolyGeneralK/arrayfire,marbre/arrayfire,ghisvail/arrayfire,pombredanne/arrayfire,bkloppenborg/arrayfire,unbornchikken/arrayfire,jramapuram/arrayfire,munnybearz/arrayfire,linan7788626/arrayfire,umar456/arrayfire,asifmadnan/arrayfire,asifmadnan/arrayfire,pombredanne/arrayfire,asifmadnan/arrayfire,ghisvail/arrayfire,marbre/arrayfire,9prady9/arrayfire,9prady9/arrayfire,marbre/arrayfire,unbornchikken/arrayfire,shehzan10/arrayfire,ghisvail/arrayfire,umar456/arrayfire,pentschev/arrayfire,Keno/arrayfire,Keno/arrayfire,Keno/arrayfire