Fix to not load the Keychain on application startup

[StanleyGoldman]

Fixes #60

[shana]

Unity enters playmode and restarts everything, we do RunCredentialHelper helper:"osxkeychain" action:"get" and we write to the input stream the user we’re trying to get, and while we’re doing this the user stops Unity, which triggers a GC collection, which goes up the tree looking for objects to collect and probably crashes on the stream access that we’re currently doing.