Change kernel

[Kiyoon Kim]

1. Add a command :JupyniumSelectKernel which will list all kernels you can switch to.

• default cursor (selection) to the current kernel
• Done in #38

2. When starting sync by creating a new ipynb file, automatically choose the appropriate kernel.

• It will only work if the neovim and Jupynium runs on the same computer.
• Don't change kernel and use the default ipython3 if it can't find the match.
• Respect filetype.
• Choose based on conda_env_path if conda environment is activated
• Done in #39

3. Add a command :JupyniumRestartKernel

• Done in #31

Useful javascript functions:

• Jupyter.kernelselector.kernelspecs
• Jupyter.notebook.kernel.name
• Jupyter.kernelselector.set_kernel('conda-env-jupyter-r')
• Jupyter.notebook.kernel.restart()
• Jupyter.kernelselector.kernelspecs['conda-env-jupynium-py'].spec.language