Added html doc generation to mksrc.sh

Added support to create html docs in addition to qch file.
Added also exit switch, to stop the script after doc build.

Change-Id: I4bc3f6c7cf3458de2396979fbf5a1ccae478133b
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>