Add API function to install a kernelspec
Add kernelspec command line entry point
Fix applications displaying subcommands
Add test for installing kernel spec
Trim which options are exposed on kernelspec CLI
Deterministic sort for kernelspec list, better error for install
Also look in /usr/local/share/ipython/kernels
Better check for systemwide install privileges
Merge pull request #5796 from takluyver/kernelspecapp

Command line interface to manage kernel specs