Merge pull request #67 from webOS-ports/tofe/work

Tofe/work
plugins: split intro three parts: common, shell and compositor

Signed-off-by: Simon Busch <morphis@gravedo.de>
Merge pull request #68 from webOS-ports/morphis/work

plugins: split intro three parts: common, shell and compositor
Compositor: do not delete the CompositorWindow object directly in closeWindowWithId

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>