Don't use javascript reserved word as Object keys

Hi,

I have observed the block.js file makes use of javascript keywords as objects keys. Ref: here.

Although this isn't prohibited, it isn't the correct thing to do.

• Editors highlight is wrongly
• Code minifiers have trouble with them.

Its best to not use them at all, in this scenarios it can be named as proceed. i.e the function returns. If that's not possible, at least you can quote them as below.

from

var object  = {
  continue: function(){}
}

object.continue();

to

var object  = {
  'continue': function(){}
}
object['continue']()

Please let me know how you wish to address this, I'll submit a PR with the changes.

Start at lib/blocks.js around line 223 and inspect the object keys that use JavaScript reserved words. Check whether the affected keys can use the suggested naming or quoted access without changing parser behavior. The work is done when reserved-word keys in this area are addressed and the existing project checks pass.