Add front-end to installation logic

Author: xpqz

dyalog_kernel/__main__.py

@@ -1,4 +1,13 @@
+import sys
 from ipykernel.kernelapp import IPKernelApp
 from . import DyalogKernel
+from .install import install_kernel_spec
 
-IPKernelApp.launch_instance(kernel_class=DyalogKernel)
+def main():
+    if len(sys.argv) > 1 and sys.argv[1] == 'install':
+        install_kernel_spec()
+    else:
+        IPKernelApp.launch_instance(kernel_class=DyalogKernel)
+
+if __name__ == '__main__':
+    main()