'verb' is now an object.

This is a fix missed at the time of filing #253.
Added the missing X-Experience-API-Version field header.
Fixed the value of the Authorization field header, according with the example.
Using capital letters for the HTTP header field names, just for readability since
field names are case-insensitive as per RFC 2616 (§4.2, "Message Headers").
Designating the encoding is somewhat redundant for JSON.
The default encoding for JSON is UTF-8, as per RFC 4627 (§3, "Encoding").
Moved Version from "1.0" to "1.0.0" as per PR comment.

Please note that 1.0 is equivalent to 1.0.0 as per spec:
https://github.com/adlnet/xAPI-Spec/blob/097552f8a9deab6ac85ba3ffa86d18fdffeb9ca6/xAPI.md#lrs-requirements-4.
Merge pull request #359 from scara/Appendix_A_Wrong_Example_Statement_Using_Bookmarklet

Appendix A: wrong example statement using bookmarklet