Large fixes, part 1

This is only part 1 of changes I have for you, so don't release yet! :smile:

## Changes made ##
* Proper AppInit extension loading
* Use double quotes in JS string and generated document
* Nicer way of using the latest Bootstrap version in the generated
document
* Use the Full Editor instead of _any_ editor
* Added `.brackets.json` file for consistent editing
* Reindent code using recommended 2 space indentation (see [codeguide.co](http://codeguide.co))