Adding missing namespace qualifiers
Adding missing namespace qualifiers

For some reason, Ubuntu compiles and runs fine without std:: qualifier
and in other OS gcc throws compiler warning.

asifmadnan/arrayfire,9prady9/arrayfire,HolyGeneralK/arrayfire,marbre/arrayfire,arrayfire/arrayfire,pavanky/arrayfire,arrayfire/arrayfire,mrgloom/arrayfire,umar456/arrayfire,asifmadnan/arrayfire,jramapuram/arrayfire,marbre/arrayfire,hshindo/arrayfire,merlin-ext/arrayfire,HolyGeneralK/arrayfire,pombredanne/arrayfire,kylelutz/arrayfire,munnybearz/arrayfire,9prady9/arrayfire,ghisvail/arrayfire,merlin-ext/arrayfire,linan7788626/arrayfire,9prady9/arrayfire,shehzan10/arrayfire,shehzan10/arrayfire,0x0all/arrayfire,shehzan10/arrayfire,9prady9/arrayfire,unbornchikken/arrayfire,ghisvail/arrayfire,jramapuram/arrayfire,ghisvail/arrayfire,arrayfire/arrayfire,bkloppenborg/arrayfire,pavanky/arrayfire,0x0all/arrayfire,victorv/arrayfire,Keno/arrayfire,pentschev/arrayfire,umar456/arrayfire,kylelutz/arrayfire,bkloppenborg/arrayfire,asifmadnan/arrayfire,munnybearz/arrayfire,asifmadnan/arrayfire,victorv/arrayfire,merlin-ext/arrayfire,pavanky/arrayfire,marbre/arrayfire,marbre/arrayfire,HolyGeneralK/arrayfire,munnybearz/arrayfire,unbornchikken/arrayfire,arrayfire/arrayfire,jramapuram/arrayfire,Keno/arrayfire,victorv/arrayfire,umar456/arrayfire,mrgloom/arrayfire,bkloppenborg/arrayfire,pentschev/arrayfire,pentschev/arrayfire,victorv/arrayfire,unbornchikken/arrayfire,bkloppenborg/arrayfire,pavanky/arrayfire,unbornchikken/arrayfire,mrgloom/arrayfire,jramapuram/arrayfire,mrgloom/arrayfire,shehzan10/arrayfire,linan7788626/arrayfire,glehmann/arrayfire,pombredanne/arrayfire,pombredanne/arrayfire,Keno/arrayfire,umar456/arrayfire,pentschev/arrayfire,hshindo/arrayfire,linan7788626/arrayfire,HolyGeneralK/arrayfire,glehmann/arrayfire,merlin-ext/arrayfire,pombredanne/arrayfire,linan7788626/arrayfire,hshindo/arrayfire,ghisvail/arrayfire,Keno/arrayfire,hshindo/arrayfire