Added args and buffer handling, but now clEnqueueNDRangeKernel is failing

with the error invalid command queue. Haven't seen that one before, and
cursory google suggests it's a problem with MBP's. Fun! I'll keep taking
a look, and I'll try it on my windows machine here soon

kernels/minimal_kernel.c

@@ -0,0 +1,5 @@
+__kernel void min_kern(__global char* in)
+{
+    int a = 10;
+    printf("%s\n", "this is a test string\n");
+}