Edit iframe in detected framework editor

[chrislatorres]

Similar to #7 and will help add detection needed for #14.

This add in the per-iframe dropdown a "Open in editor" button that opens the site in the appropriate framework editor.

This will require:

• detecting what framework a site is using. (maybe look for script tag names like aframe.min.js or a <a-scene> tag)
• loading the site into the editor

Specific editors to detect:

• https://github.com/mrdoob/three.js/tree/dev/editor
• https://github.com/aframevr/aframe-inspector
• https://github.com/BabylonJS/Editor

[chrislatorres]

Can look for logging, for example:

• A-Frame Version: 0.7.0 (Date 2018-02-05, Commit #39daf67)
• Babylon.js v4.1.0-alpha.4 - WebGL2
• THREE.WebGLRenderer 105