Add support for login tokens

As of Bugzilla 4.4.3+ login cookies are no longer supported.

"The User.login WebService method now also returns a token argument
containing a login token which you can use in subsequent calls to
authenticate. For security reasons, this method no longer generates login
cookies. (Bug 893195)"

http://www.bugzilla.org/releases/4.4.3/release-notes.html#v44_point
http://www.bugzilla.org/docs/tip/en/html/api/Bugzilla/WebService.html#LOGGING_IN
refactored token handling

Debatable wether this is preferred. The base package now knows about the LogIn
class.
Fix GetProductIT version check

Periods need to be escaped in regex.
Support up to Bugzilla 4.4 in GetProductIT