Add encryption and authentication to all messages so that messages are secret
and are always known to come from a source that knows the private key.

SECURITY:
Describe latest security system using SOBER, SHA1, and HMAC.
QUICKSTART:
Add details to creating security key to quickstart guide.
LICENSE:
Add libtomcrypt's license text for crypto.c and crypto.h
Makefile:
Add crytpo features to makefile
gmi.h:
Add ability to pass key and keylen to gmi_init.
Add ability to set security logging value.
gmi.c:
Add encryption and authentication to GMI.

BKrev: 4117ed75MEkDZv2CoCUYGolBNHy17Q


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@165 fd59a12c-fef9-0310-b244-a6a79926bd2f