Prepare the directories to have more examples included.

This also ajust the name to be consistent with other Qt examples.
- Move nano browser one directory level down,
  also renaming them to match their target name
- Remove the dashes from the target names
- Rename the qtquick example directory to quick, matching the style in lib

Change-Id: I4a5e31be0b919ae596eadbf731be52372ae61151
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
Detach common.pri from the nano browser examples.

Move common.pri to the root directory to be able to use it with tests.
Remove nano browser specific logic (util.h include and common resources)
from this file and use relative paths in the examples instead.

This also remove unnecessary directives:
- lib doesn't have to be added to INCLUDEPATH since proper modules are used
- util.h doesn't need to be added to HEADERS, moc doesn't need to go through it
- MOC_DIR doesn't have to be adjusted anymore

Change-Id: Id706e7f2ef7c9607bdcd0ba63afecf5b5854262b
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>
Change "Contents" to "Engine" in API class names.

Change-Id: I58d83f4f33728f92e4bf13b6be30b15528fdd033
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>