Add "profile" parameter to webclient

Add "profile" parameter to the webclient. This will be a parameter to the service given trough workflow. It should support following values:

"Internet Explorer 6" = INTERNET_EXPLORER_6
"Internet Explorer 7" = INTERNET_EXPLORER_7
"Internet Explorer 8" = INTERNET_EXPLORER_8
"Firefox 3" = FIREFOX_3
"Firefox 3.6" = FIREFOX_3_6
"Firefox 10" = FIREFOX_10
"Chrome 16" = CHROME_16

Default value is "Firefox 3.6".