(cherry picked from commit 40f049ba)

This reverts commit 8ed54fd3.

This reverts commit 938226ee.

This reverts commit 2d1e6e60.

XCOMMONS-604: When upgrading on root an extension installed on a subwiki it should be removed from subwiki index

* remove debug leftover

    * follow API changes

* follow API changes

XCOMMONS-606: Upgrade to httpclient 4.3.4
XCOMMONS-607: Upgrade to commons-beanutils 1.9.2
XCOMMONS-608: Upgrade to reflections 0.9.9-RC2
XCOMMONS-609: Upgrade to slf4j 1.7.7

XCOMMONS-604: When upgrading on root an extension installed on a subwiki it should be removed from subwiki index

XWIKI-10467: Scripting API fails to set the content type when calling the Default Mime Body Part Factory
+ increased StandardEnvironment's component priority so that it's loaded before ServletEnvironment in case both are present in the classloader. This allows to have an order and makes it possible to test code where both components are in the Classloader.
 + Added integration test for verifying that we can send a calendar invitation by email

XCOMMONS-604: When upgrading on root an extension installed on a subwiki it should be removed from subwiki index

XCOMMONS-603: Allow executing two extensions related jobs at the same time if they don't collide

Add leftover components.txt