Merge pull request #386 from Eighke/development

Labelclass is different on 2.5 and 3.x
~ Installation script: work around Joomla!'s bad use of caching regarding modules and plugins
~ Installation script: work around Joomla!'s bad use of caching regarding modules and plugins (part 2 of the fix)
+ Cache cleaner utility class to help you clean Joomla!'s cache
# [MEDIUM] Joomla! caches plugin information, leading to unexpected behaviour in various places
Oops, wrong changelog
I forgot to push one line
Removed $recursive params: we always have to remove the children
gh-388
Override parent delete function, so we can run the onBeforeDelete check *BEFORE* starting to delete the children
gh-388
Shrink lft and rgt values after node deletion
gh-388
Delete all the subnodes, always reloading the info from the database.
Updated tests to check lft and rgt values of  other nodes, too.
gh-388
Added tests when onBeforeDelete returns false
If a subnode returns false, continue deleting the siblings, but don't delete the parent
gh-388
Added tests when the table is loaded
gh-388
Merge pull request #389 from akeeba/feature/388-fix-nested-delete

F0FTableNested - Fix delete
Support for pdomysql driver to be added in Joomla! 3.4
+ Installation script: add support for post-installation messages in Joomla! 3.2 or later
+ Installation script: add support for post-installation messages in Joomla! 3.2 or later
+ Installation script: add support for post-installation messages in Joomla! 3.2 or later and also uninstall them on extension uninstallation
If we're in frontend, use absolute links inside form action attribute
Close #390
Changelog update