Simplify the Library implementation slightly:
Simplify the Library implementation slightly:

* Remove _initialized flag and just test if self._lib is None. This removes an obnoxious error in the event you try to inspect ._lib before Library is initialized
* Removed the caching of attributes on self, and instead always do the lookup on Lib

reaperhulk/pynacl,hoffmabc/pynacl,scholarly/pynacl,Insoleet/cutecoin,xueyumusic/pynacl,pyca/pynacl,reaperhulk/pynacl,ucoin-io/cutecoin,ucoin-bot/cutecoin,reaperhulk/pynacl,hoffmabc/pynacl,JackWink/pynacl,xueyumusic/pynacl,reaperhulk/pynacl,JackWink/pynacl,JackWink/pynacl,scholarly/pynacl,pyca/pynacl,pyca/pynacl,ucoin-io/cutecoin,scholarly/pynacl,ucoin-io/cutecoin,reaperhulk/pynacl,lmctv/pynacl,pyca/pynacl,xueyumusic/pynacl,scholarly/pynacl,lmctv/pynacl,pyca/pynacl,lmctv/pynacl,lmctv/pynacl,lmctv/pynacl,JackWink/pynacl,xueyumusic/pynacl,hoffmabc/pynacl