refactored the constructor and create static method for 'boostrapping…

… the UserAgentParser'

parseOs and parserWebClient returns now the matched components

add user agent class

getName returns now undefined instead null

remove the depency from global var. parseUserAgent expects now a user…

…agent argument.

prepraing for elimination of singelton pattern

use mocks now for webClient methods

add method addWebClient,removeWebClient,removeWebClientByClassName,ge…

…tWebClients,getUndefinedWebClient,setUndefindeWebClient

replace the switch case with a foreach

using the web client component now