speed up getting entities via wrapper by id as number/string value (i.e. EntityType(id))
basis.net.* small refactoring

- basis.net.ajax
  * add support for responseType
  * don't store resposeText/responseXML in request#data
  * don't store error in request#data
  * cleaner
- small cleanup basis.net.jsonp & basis.net.soap
make basis.json.parse throw an exception when JSON.parse fallback using