QmlJS: Allow for QML modules with version subdirectories.

That means
import Foo 2.1
can resolve to
/path/Foo.2.1 or
/path/Foo.2 or
/path/Foo

Task-number: QTCREATORBUG-4607
Change-Id: Ie1efc5be2ca2ed3ccc130e8a662f94aed11bec1ax
Reviewed-on: http://codereview.qt.nokia.com/194


Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
(cherry picked from commit 87420263)
Reviewed-on: http://codereview.qt.nokia.com/380


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: hjk <qthjk@ovi.com>