It is useful to be able to disable the t-transition directive for
testing purposes. This commit introduces a global config flag to do
just that.
closes#768
It now takes two arguments: parent (optional, only for non-root
components) and props (optional). In the case of the root component,
the env is taken from the config (config.defaultEnv). If it doesn't
exists, the default env is created on the fly.
Closes#306
Géry Debongnie