Integrate sha1 hash helper function
README: remove sha1.js script tag
Add CHANGELOG entry for #54
Resolve #54 Integrate sha1 hash library
"use strict";
Rename _parse_str helper function to indicate private visibility
Fix typeof ... === boolean, not bool
Rename _base64_encode helper to indicate private visibility
Drop dead commented code in _url helper
Rework _http_build_query helper to indicate private visibility
Rename local variables in _ksort helper
Clean up internal helper functions
Add AMD definition and loader
Fix JSHint warnings
Add CHANGELOG entry for #53
Don't rely on global window object if undefined
Extract _getXmlRequestObject helper function
Add README section on using Codebird as AMD module
Resolve #53 Support AMD module definition syntax