Minor import fix in makeProfileGraph funciton.
Minor import fix in makeProfileGraph funciton.

Fixes problem of gprof2dot getting imported as a module rather than a class.

chatelak/RMG-Py,nickvandewiele/RMG-Py,comocheng/RMG-Py,nyee/RMG-Py,nyee/RMG-Py,nickvandewiele/RMG-Py,chatelak/RMG-Py,comocheng/RMG-Py,pierrelb/RMG-Py,pierrelb/RMG-Py,enochd/RMG-Py,enochd/RMG-Py