Add more documentation and tests for options.currentUrlFullReload

Closes #17

tests/lib/proto/parse-options.js

@@ -23,6 +23,7 @@ tape("test parse initalization options function", function(t) {
     t.equal(pjax.options.scrollRestoration, true)
     t.equal(pjax.options.cacheBust, true)
     t.equal(pjax.options.debug, false)
+    t.equal(pjax.options.currentUrlFullReload, false)
     t.end()
   })