Fix broken of running animation - Running animation is stop automatically after a certain time. - It is 300ms according MBScene._updateUI(). - It is caused by notification of changing DOM tree. The notification handlers would call MBScene.updateUI() to update framelines and buttons. - MBScene.updateUI() would call MBScene.show() after 300ms, MBScene.show() calls MBScene.parseScene() in turn. - MBScene.parseScene() would remove duplicate group that is using by code of running animation, MBScene.doRunNext(). It make running animation stop. - fixed by setting MBScene.lockui when a running animation is started or stoped.

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/*! \defgroup xnjsmb MadButterfly JS binding for V8 and nodejs
 *
 * This implementation of JS binding heavily relies on
 * tools/gen_v8_binding.m4, a set of m4 macros.  We defines binding in
 * nodejs/*.m4 files and generate respective code, nodejs/*-inc.h,
 * with macros defined in tools/gen_v8_binding.m4.  *-inc.h files are
 * included by respective *.cc files they implement functions needed
 * by generated code.
 */