added a check against using a non-initialized ConfigScope
changed semantics of BlockingDict
can't access a fixed value before trying to set it anymore
updated BlockingDict and renamed it
added DogmaticList
renamed blocking_dictify to dogmatize and have it use DogmaticLists also
added some tests for DogmaticDict
changed semantics of DogmaticList to be immutable
renamed project to sacred
set up tox testing and fixed some setup and python 3 issues