Updated ESLint rule: curly, again.
Mainly to also enabled "consistent" rule, which enforces curly into
else/elseif blocks, if its if block requires curly.
Added support for GET requests to /api/delete route.
Its usage is /api/delete/identifier, where identifier is the filename.
Though just like its POST route, it needs token in the header.
No more enforced curly for if/else/for/while/do blocks w/ one statement.
With that said, auto-fixed all JS files to follow the rule.
I'd also like to apologize for the inconveniences this commit cause,
after all it was me who intentionally enforced curly rule back then.
Why the change of heart?
After doing some more non-JS codes recently, I realized it was
pretty stupid of me to enforce that.
This commit is intended to downgrade codes in JS files used for browser to increase browsers compatibility.
This branch is still experimental and may require much more testing.
* Bumped node requirement to >= 8.0.0 (due to async/await).
* Moved ESLint config to .eslintrc.json.
* Moved ESLint ignore to .eslintignore.
* Bumped ESLint's ecmaVersion to 8, although it was probably already automatically set to that before.
* Bugfix line 110 of albumsController.js.
