Add images support

[rafaelrinaldi]

This PR adds image support to slides (thanks to iTerm).

# Images

![ron](ron.png)

Ron Swanson and his ice cream

![pizza](pizza.png)

There's anything a pizza can't solve

Notes

• Will parse markdown images (does not support HTML image tags)
• Will do nothing if terminal does not support images (currently a simple check to TERM_PROGRAM to figure it out)
• Add images option which is true by default (let me know if it should be false by default)
• User can turn off images with --no-images

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Let me know if PR looks good. I can make any adjustments if needed.

[dominictarr]

cool, my terminal (on linux doesn't support this) but it doesn't do anything weird, so I'll merge.
can you add an example image to the readme so that all tslide features are demonstrated via the readme?

[rafaelrinaldi]

@dominictarr Done. What do you think?

[dominictarr]

that image doesn't display in github, I think you need to use an relative link, and check it into the repo.
Also, especially, you could you put the embedded image in image section?

[rafaelrinaldi]

@dominictarr Done.

[dominictarr]

you are missing screenshot.png

[rafaelrinaldi]

@dominictarr That's not needed anymore. See: https://github.com/rafaelrinaldi/tslide/tree/feat/images

[dominictarr]

okay, just one more thing: this currently loads files relative to the cwd (i think, can't test) but pretty sure that is what happens when you do fs.readFileSync(filename)

Of course, the filenames should be relative to the md file, so it should be dir=path.dirname(input); fs.readFileSync(path.join(dir, filename))

otherwise, you can't do tslide ../README.md

[rafaelrinaldi]

@dominictarr Good catch. Fixed too.