Show expansion sources in tooltip.
Toggleable simple text view.
Add simple text view option.
Merge branch 'master' into feature/simple_text_view

Conflicts:
	index.html
	javascripts/xwing.js
	javascripts/xwing.map
	javascripts/xwing.min.js
	javascripts/xwing.min.map
Update readme.
Merge branch 'feature/simple_text_view'