Fix qtip viewport overflow.

The qtips under the permissons was overflowing left of the screen and only half of the text was readable. To activate position.adjust.method plugin, I added the viewport option. Also changed default adjust method to shift instead of flip.

assets/js/app.coffee

@@ -20,7 +20,7 @@ class Choosealicense
   qtip_position:
     my: "top center"
     at: "bottom center"
-
+    viewport: $(window)
   # Annotation rule types as defined in `_config.yml`
   ruletypes:
     permissions: "Permission"

assets/vendor/qtip2/jquery.qtip.js

@@ -1924,7 +1924,7 @@ QTIP.defaults = {
 			mouse: TRUE,
 			scroll: TRUE,
 			resize: TRUE,
-			method: 'flipinvert flipinvert'
+			method: 'shift shift'
 		},
 		effect: function(api, pos, viewport) {
 			$(this).animate(pos, {