skip serialization test if capnp is not installed
skip serialization test if capnp is not installed

lscheinkman/nupic,blueburningcoder/nupic,EricSB/nupic,vitaly-krugl/nupic,blueburningcoder/nupic,rcrowder/nupic,lscheinkman/nupic,vitaly-krugl/nupic,scottpurdy/nupic,numenta/nupic,marionleborgne/nupic,cogmission/nupic,marionleborgne/nupic,arhik/nupic,numenta-ci/nupic,cogmission/nupic,badlogicmanpreet/nupic,rhyolight/nupic,EricSB/nupic,rcrowder/nupic,subutai/nupic,rcrowder/nupic,arhik/nupic,marionleborgne/nupic,badlogicmanpreet/nupic,pulinagrawal/nupic,pulinagrawal/nupic,rhyolight/nupic,lscheinkman/nupic,pulinagrawal/nupic,alfonsokim/nupic,subutai/nupic,cogmission/nupic,numenta-ci/nupic,alfonsokim/nupic,numenta/nupic,subutai/nupic,scottpurdy/nupic,ywcui1990/nupic,neuroidss/nupic,rhyolight/nupic,alfonsokim/nupic,neuroidss/nupic,blueburningcoder/nupic,badlogicmanpreet/nupic,numenta-ci/nupic,arhik/nupic,numenta/nupic,vitaly-krugl/nupic,EricSB/nupic,ywcui1990/nupic,ywcui1990/nupic,scottpurdy/nupic,neuroidss/nupic