Code cleanup (#120)

* Lots of code cleanup

* Cleanup parse-options tests
  - Rename objects for clarity and inline unneeded objects
  - Remove unneeded tests
  - Use Object.keys().length instead of a custom function
  - Use typeof === "object" instead of a custom function that checks the prototype tree as well, since we don't expect anything but an object literal.

* Remove old switchFallback code

* Remove polyfill for Function.prototype.bind

* Inline small functions

* Add more documentation and tests for options.currentUrlFullReload
  Closes #17

* Update package.json

lib/proto/attach-link.js

@@ -1,5 +1,3 @@
-require("../polyfills/Function.prototype.bind")
-
 var on = require("../events/on")
 var clone = require("../clone")
 
@@ -9,10 +7,10 @@ var attrKey = "data-pjax-keyup-state"
 var linkAction = function(el, event) {
   // Since loadUrl modifies options and we may add our own modifications below,
   // clone it so the changes don't persist
-  var options = clone(this.options);
+  var options = clone(this.options)
 
   // Initialize requestOptions since loadUrl expects it to be an object
-  options.requestOptions = {};
+  options.requestOptions = {}
 
   // Don’t break browser special behavior on links (like page in new window)
   if (event.which > 1 || event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) {
@@ -66,7 +64,7 @@ var linkAction = function(el, event) {
 }
 
 var isDefaultPrevented = function(event) {
-  return event.defaultPrevented || event.returnValue === false;
+  return event.defaultPrevented || event.returnValue === false
 }
 
 module.exports = function(el) {
@@ -91,7 +89,7 @@ module.exports = function(el) {
       return
     }
 
-    if (event.keyCode == 13) {
+    if (event.keyCode === 13) {
       linkAction.call(that, el, event)
     }
   }.bind(this))