Merge pull request #1 from joomla/master

merge source from joomla/master
Merge remote-tracking branch 'origin/master' into joomla-tutor
Delete installation directory
Push Helloworld component part 1
Merge branch 'joomla-tutor' of git://github.com/bngnha/joomla-cms into joomla-tutor

Conflicts:
	administrator/components/com_helloworld/index.html
	components/com_helloworld/index.html
	robots.txt
Merge branch 'joomla-tutor' of git://github.com/bngnha/joomla-cms into joomla-tutor

Conflicts:
	administrator/components/com_helloworld/index.html
	components/com_helloworld/index.html
	robots.txt
Update build properties
Add HelloWorld Component from Part06
Add HelloWorld Component from Part08