Update insert image action: support uploading local image

[tatwd]

using Fetch API and add a option to settings:

{
  upload: {
    api: 'http://xxx'
  }
}

Active default action for not config this option in init method.

[KubqoA]

Any updates on this? Would be really nice to have this feature

[Vitormdias]

Will you guys merge this ? it would really help

[jaredreich]

Very unlikely, this nearly doubles the size of the source file. This is a great candidate for the plugin system, which will be implemented in 2.0.