add support for arbitrary envelope parameters, and allow users to override the escape mechanism too
add support for arbitrary envelope parameters, and allow users to override the escape mechanism too


git-svn-id: 1dc8261ca909f20fce6cfd8a2ef29e7db7f5be91@245 5914aa95-5b3a-0410-a3b5-7b719e7fe9b2

yuvadm/freebase-python,yuvadm/freebase-python