More things we need

• Fork unrolling (Russel, !165 (merged))
• Constants sized array to prod (Aaron, !174 (merged))
• Poke at medianMatrix (Russel) - [ ] CPU Vectorization (Russel)
• Add ability to indicate labels to xdot and ability to xdot individual functions (Russel, !163 (merged))
• async calls (Russel, !164 (merged))
• einsum cudnn (Russel / Xavier, !187 (merged))