Add cterm support

[gko]

Second attempt. Vim on the left and neovim on the right. There are for sure some colors that might be slightly off. And you have to apply the color profile within iTerm. Alternatively we can define black color within palette as our background color. That is what @chriskempson did: https://github.com/chriskempson/base16-shell/blob/master/scripts/base16-material-palenight.sh#L6

I also didn't manage to make work the italics in vim.

To test add to your .vimrc:

Plug 'gko/material.vim', { 'branch': 'add_cterm_support' }

see #40

Airline

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Palenight

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Darker

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Ocean

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Lighter

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Lightline

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Palenight

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Darker

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Ocean

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Lighter

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[kaicataldo]

And thanks for the all the screenshots :pray: This is super helpful for posterity!