Add file extensions support for major languages

[ybiquitous]

This adds aliases for file extensions of some major languages.

• .coffee -> .coffeescript
• .md -> .markdown
• .py -> .python
• .rb -> .ruby
• .yml -> .yaml

Such as:

prism/components/prism-javascript.js

Line 56 in 7d084d5

Prism.languages.js = Prism.languages.javascript;

[mAAdhaTTah]

Seems reasonable. @LeaVerou @Golmote any objections?

[mAAdhaTTah]

@ybiquitous If you resolve this conflict, I'm good to merge this.

[ybiquitous]

@mAAdhaTTah Sorry late reply. 🙇

I merged right now, please check it when you have a time!

[RunDevelopment]

@ybiquitous
Please also run gulp to generate the minified files.

[ybiquitous]

@RunDevelopment Sorry, I pushed now minified version via gulp. 👍

[ybiquitous]

By the way, what about thinking about auto-minification?

For example, Using lint-staged and husky can force to generate and commit minified files before commiting *.js files.

// package.json
{
  "husky": {
    "hooks": {
      "pre-commit": "lint-staged",
    }
  },
  "lint-staged": {
    "*.js": ["gulp", "git add"]
  }
}

[RunDevelopment]

This certainly is an interesting option.

@mAAdhaTTah What do you think?

[mAAdhaTTah]

@RunDevelopment I'm into it. We use that combo @ work without issues. We had also talked about introducing ESLint (#1483); might be worth bundling that together.