- added config method that excepts objects with props:
   - valueKey (default: keyValue)
   - attrKey (default: keyAttributes)
   - attrPrefix (default: @)
   - lowerCaseTags (default: true)
   - trueIsEmpty (default: true)
   - autoDate (default: true)
- converting tag and attributes to lower case is optional
- optional converting boolean true to empty tag
- auto Date parsing is optional
Update README.md
Update README.md
Update README.md
added setValAttrPropPref for backward compatibility
updated manifest files
added aliases toJs(build), toXml(unbild)
added checks for XMLSerializer
refactor, interface cleanup, update docs
some minor tweaks

* drop legacy support for "setValAttrPropPref"
* re-introduce "stringify" method (alias for jsToString endpoint)
* code style (indention = 2 spaces, as in original MDN code
Merge branch 'igord-master'